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

You are not logged in.

- Topics: Active | Unanswered

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 19,196

Hi bobbym and Maiya,

The solution T#20 is 200 √3 + 200 meters = 546.4 meters approximately.

Excellent, bobbym! Keep trying, Maiya!

T#21. If the value of cos A = 1/√2, find the value of tan A.

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.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 100,453

Hi ganesh;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**Maiya****Member**- Registered: 2011-08-11
- Posts: 124

hello Ganesh;

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 19,196

Hi bobbym and Maiya,

The solution T#21 is correct. Good work!

T#22. A lighthouse was observed from two points in a line with it, but on opposite sides of it. The distance between the points is 120 meters. If the angle of elevation are 30[sup]o[/sup] and 45[sup]o[/sup], find the height of the lighthouse.

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.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 100,453

Hi ganesh;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**Maiya****Member**- Registered: 2011-08-11
- Posts: 124

Hello Ganesh;

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 19,196

Hi bobbym and Maiya,

The solution T#22 is

meters. Neat job, bobbym!T#23. Two men are on the opposite sides of a tower. They measure the angles of elevation of the top of the tower as 30° and 45° respectively. If the height of the tower is 150 meters, find the distance between the men.

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.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 100,453

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**Stormtangent****Member**- Registered: 2011-09-03
- Posts: 33

Hey guys! I haven't been online... here's a couple answers

"Have you ever had a dream that you were so sure was real? What if you were unable to wake from that dream? How would you know the difference between the dream world and the real world? "

Offline

**Stormtangent****Member**- Registered: 2011-09-03
- Posts: 33

"A couple"... lol, my bad.

"Have you ever had a dream that you were so sure was real? What if you were unable to wake from that dream? How would you know the difference between the dream world and the real world? "

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 19,196

Hi bobbym and Stormtangent,

bobbym : The solution T#23 is perfect. Excellent!

Stormtangent : The solutions T#21, T#22, and T#23 are perfect. Brilliant!

T#24. From the top of a lighthouse, the angles of depression of two ships floating in a straight line on either sides of the lighthouse are observed as 30[sup]o[/sup] and 45[sup]o[/sup]. If the height of the lighthouse is 200 meters, find the distance between the ships.

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 100,453

Hi ganesh;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**Maiya****Member**- Registered: 2011-08-11
- Posts: 124

Hello Ganesh;

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 19,196

Hi bobbym and Maiya,

bobbym : The solution T#24 is correct. Excellent!

Maiya : The solutions T#23 and T#24 are correct. Excellent!

T#25. If cos A = ½, then tan 2A = ?

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 100,453

Hi ganesh;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**Maiya****Member**- Registered: 2011-08-11
- Posts: 124

Hello Ganesh;

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 19,196

Hi bobbym and Maiya,

The solution T#25 is correct. Stupendous!

T#26. Find the value of

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 100,453

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**Maiya****Member**- Registered: 2011-08-11
- Posts: 124

Hello Ganesh;

*Last edited by Maiya (2011-11-28 23:41:40)*

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 19,196

Hi bobbym and Maiya,

The solution T#26 is correct, bobbym! Superlative!

T#27. What is the value of sin30sin45sin60 (in degrees)?

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 100,453

Hi ganesh;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 15,984

hi ganesh

*Last edited by anonimnystefy (2011-12-28 03:27:28)*

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 19,196

Hi bobbym and anonimnystefy,

The solution T#27 is correct. Good work!

T#28. Evaluate :

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 100,453

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 19,196

Hi bobbym,

The solution T#28 is correct. Neat work!

T#29. Evaluate :

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

Offline