# Math Is Fun Forum

Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

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## #1001 2020-08-29 16:52:06

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 633

### Re: Mensuration

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #1002 2020-08-29 20:05:40

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

Good attempt!

M # 604. Base area of a cone is 81π, height 12. Calculate volume.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1003 2020-09-01 16:38:22

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

M # 605. Calculate the surface area of a sphere of volume

cubic centimetres.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1004 2020-09-05 15:21:11

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 633

### Re: Mensuration

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #1005 2020-09-05 20:00:41

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

Neat work!

M # 606. Three solids of a square pyramid, a cone and a sphere have been carved out from three solid cubes of the same size. Find the volume of each solid.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1006 2020-10-03 13:11:17

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 633

### Re: Mensuration

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #1007 2020-10-03 14:16:59

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Well tried!

M # 607. All the edges of a square pyramid area of equal length. The height of the pyramid is 12 centimetres. What is its volume?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1008 2020-10-10 20:53:03

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 633

### Re: Mensuration

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #1009 2020-10-10 22:13:44

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Keep trying!

M # 608. All edges of a square pyramid are equal. Total length of all the edges is 96 cm. Find the volume of the square pyramid.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1010 2020-10-17 12:55:17

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 633

### Re: Mensuration

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #1011 2020-10-17 13:20:44

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Well done!

M # 609. Slant height of a square pyramid is 25 cm and its surface area is 896 square centimetres. Find the volume of the square pyramid.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1012 2020-10-24 18:02:53

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 633

### Re: Mensuration

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #1013 2020-10-24 18:55:04

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

.

Neat work!

M # 610. Find the ratio of base edge, slant height, and height of a square pyramid with its edges equal.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1014 2020-10-31 15:11:02

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 633

### Re: Mensuration

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #1015 2020-10-31 16:40:41

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

Keep trying!

M # 611. A solid sphere is cut into two hemispheres. From their spheres, a maximum size of a square pyramid and cone are cut off. What is the ratio of their volumes?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1016 2020-11-30 23:02:24

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

M # 612. The central angle of a sector is 216° and radius 25 cm has been rolled up to form a cone. Find the radius, height, and volume of the cone.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1017 2020-12-01 12:05:59

Denominator
Member
Registered: 2009-11-23
Posts: 215

### Re: Mensuration

Hello,

Last edited by Denominator (2020-12-01 12:06:17)

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## #1018 2020-12-01 14:48:31

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

Neat work!

M # 613. The base radius of a cone is two times the height. It is melted and recasted into cones of same height and radius half the height. How many cones can be made?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1019 2021-01-01 15:18:07

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

M # 614. Two hemispheres are attached together to get a sphere. Surface area of each hemisphere is 60 sq cm. Find the surface area of the sphere.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1020 2021-01-02 07:08:42

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Mensuration

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1021 2021-01-02 13:02:04

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

Well tried!

M # 614. A square pyramid is made from a sold cube having edge 30 cm.Find the surface area of the pyramid. (Approximately)

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Online

## #1022 2021-01-24 12:46:00

Denominator
Member
Registered: 2009-11-23
Posts: 215

### Re: Mensuration

Hello

Last edited by Denominator (2021-01-24 12:46:33)

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## #1023 2021-01-24 14:06:20

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

Excellent!

615. The lateral face of a square pyramid are all equilateral triangles. Find the ratio of its height and slant height.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1024 2021-01-25 09:12:14

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Mensuration

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1025 2021-01-25 14:21:43

ganesh
Registered: 2005-06-28
Posts: 33,310

### Re: Mensuration

Hi,

Excellent!

M # 616. A cone of height 8 centimetres is to be made using a sector of circle of radius 10 centimetres. What should be the central angle of the sector?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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