# Math Is Fun Forum

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

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## #1026 2021-01-26 06:08:52

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

### Re: Mensuration

I’d like to add a big thank you for posting all the questions too.

Last edited by irspow (2021-01-26 06:14:47)

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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## #1027 2021-01-26 15:10:00

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

### Re: Mensuration

Hi,

irspow wrote:

I’d like to add a big thank you for posting all the questions too.

My pleasure, irspow!

Solution M#616 : Excellent!

M#617. All the edges of a square pyramid are of equal lengths. If the length of the base is 30 centimeters,
(a) find the slant height.
(b) find the lateral surface area.

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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## #1028 2021-01-27 07:13:48

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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## #1029 2021-01-27 14:14:44

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

### Re: Mensuration

Hi,

.

Excellent!

M#618. The slant height of a frustum of a cone is 4 cm and perimeter (circumference) of its circular ends are 18 cm and 6 cm. Find the curved surface area of the frustum.

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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## #1030 2021-01-29 08:14:28

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

### Re: Mensuration

Last edited by irspow (2021-01-29 11:00:33)

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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## #1031 2021-01-29 14:45:29

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

### Re: Mensuration

Hi,

Excellent!

M#619. A circular sheet of radius 18 centimetres is divided into 9 equal areas.
(a) Find the measure of the central angle of a sector.
(b) Find the slant height of a cone which can be made by a 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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## #1032 2021-01-30 09:53:22

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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## #1033 2021-01-30 14:11:16

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

### Re: Mensuration

Hi,

Neat work!

M#620. The base area of a cone is

cm and curved surface area is
. Calculate the total surface area.

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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## #1034 2021-01-31 07:44:05

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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## #1035 2021-01-31 14:36:50

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

### Re: Mensuration

Hi,

Good work!

M#621. What is the change in volume of a sphere if its radius becomes three times?

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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## #1036 2021-02-01 08:17:52

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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## #1037 2021-02-01 15:11:41

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

### Re: Mensuration

Hi,

Neat work!

M#622.

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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## #1038 2021-02-03 05:25:20

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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## #1039 2021-02-03 14:19:14

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

### Re: Mensuration

Hi

Neat work!

M#623. A rectangular park 100 m by 20 m has a gravel path 2 m wide on all four sides, outside the path. Find the area of the path.

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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## #1040 2021-02-04 07:35:05

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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## #1041 2021-02-04 14:51:06

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

### Re: Mensuration

Hi,

Neat work!

M#624. A rectangular field 172 m by 58 m has a path of uniform width, inside all the four sides.Find the width of the path.

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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## #1042 2021-02-05 06:44:02

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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## #1043 2021-02-05 14:16:41

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

### Re: Mensuration

Hi,

Edited : M#624. A rectangular field 172 m by 58 m has a path of uniform width, inside all the four sides. The area of the path is 1125 square metres. Find the width of the path.

Inconvenience regretted.

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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## #1044 2021-02-07 05:22:37

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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## #1045 2021-02-07 14:46:49

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

### Re: Mensuration

Hi,

Excellent!

M#625. The ratio of the length and breadth of a room is 3 : 1. If the height of the room is 13 meters while the area of its four walls is 1664 square meters, then find the area of the ceiling.

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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## #1046 2021-02-08 07:29:17

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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## #1047 2021-02-08 13:59:33

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

### Re: Mensuration

Hi,

Neat work!

M#626. The area of a rectangular field is 0.5 hectare. If the field is 5 kilometers long, then find the width of the field.

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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## #1048 2021-02-09 05:54:36

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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## #1049 2021-02-09 14:59:28

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

### Re: Mensuration

Hi,

Neat work!

M#627. The perimeter of the floor of a room is 18 meters. What is the area of the walls of the room, if the height of the room is 3 meters?

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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## #1050 2021-02-10 05:36:41

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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