Math Is Fun Forum

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,390

Re: Trigonometry

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.

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Trigonometry

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.
Always satisfy the Prime Directive of getting the right answer above all else.

Maiya

Member

Registered: 2011-08-11

Posts: 124

Re: Trigonometry

hello Ganesh;

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,390

Re: Trigonometry

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.

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Trigonometry

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.
Always satisfy the Prime Directive of getting the right answer above all else.

Maiya

Member

Registered: 2011-08-11

Posts: 124

Re: Trigonometry

Hello Ganesh;

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,390

Re: Trigonometry

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 appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Trigonometry

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Stormtangent

Member

Registered: 2011-09-03

Posts: 33

Re: Trigonometry

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

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"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? "

Stormtangent

Member

Registered: 2011-09-03

Posts: 33

Re: Trigonometry

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

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"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? "

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,390

Re: Trigonometry

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.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Trigonometry

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.
Always satisfy the Prime Directive of getting the right answer above all else.

Maiya

Member

Registered: 2011-08-11

Posts: 124

Re: Trigonometry

Hello Ganesh;

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,390

Re: Trigonometry

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 = ?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Trigonometry

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.
Always satisfy the Prime Directive of getting the right answer above all else.

Maiya

Member

Registered: 2011-08-11

Posts: 124

Re: Trigonometry

Hello Ganesh;

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,390

Re: Trigonometry

Hi bobbym and Maiya,

The solution T#25 is correct. Stupendous!

T#26. Find the value of

.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Trigonometry

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Maiya

Member

Registered: 2011-08-11

Posts: 124

Re: Trigonometry

Hello Ganesh;

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

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,390

Re: Trigonometry

Hi bobbym and Maiya,

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

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

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Trigonometry

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.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: Trigonometry

hi ganesh

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

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“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.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,390

Re: Trigonometry

Hi bobbym and anonimnystefy,

The solution T#27 is correct. Good work!

T#28. Evaluate :

.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Trigonometry

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,390

Re: Trigonometry

Hi bobbym,

The solution T#28 is correct. Neat work!

T#29. Evaluate :

.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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