# Aptitude - Height and Distance - Discussion

Discussion Forum : Height and Distance - General Questions (Q.No. 4)

4.

An observer 1.6 m tall is 203 away from a tower. The angle of elevation from his eye to the top of the tower is 30°. The height of the tower is:

Answer: Option

Explanation:

Let AB be the observer and CD be the tower.

Draw BE CD.

Then, CE = AB = 1.6 m,

BE = AC = 203 m.

DE | = tan 30° = | 1 |

BE | 3 |

DE = | 203 | m = 20 m. |

3 |

CD = CE + DE = (1.6 + 20) m = 21.6 m.

Discussion:

18 comments Page 1 of 2.
Vivek Sunny said:
2 years ago

No @Abirami..

cos = adjacent/hypotenuse

tan= opposite/adjacent

For simply, remember...

SOHCAHTOA

where,

s- Sin.

o- Opposite.

h- Hypotenuse.

c- Cos.

t- Tan.

cos = adjacent/hypotenuse

tan= opposite/adjacent

For simply, remember...

SOHCAHTOA

where,

s- Sin.

o- Opposite.

h- Hypotenuse.

c- Cos.

t- Tan.

Abirami said:
3 years ago

Opp/adj is cos not tan.

So, the answer is 31.6.

Thus none of these is the answer.

So, the answer is 31.6.

Thus none of these is the answer.

Pooja Kale said:
4 years ago

Remember basic rule,

If Finding :

Perpendicular : Sin

Hypotenuse : cos

Base : tan

If Finding :

Perpendicular : Sin

Hypotenuse : cos

Base : tan

(2)

Kesavan said:
4 years ago

I'm not getting whether to use tan or cos. Please, anyone, clarify it in detail.

Dipakk said:
4 years ago

@Jatin.

Why EC & ED added?

Why EC & ED added?

Akshatha said:
5 years ago

@Rocky.

Yes, it is the right answer.

Yes, it is the right answer.

Midhun said:
5 years ago

@Akshaya Prasad.

We use tan, sin or cos depending upon what we want to get and what they have given in the question.

For example. If they give opposite side and you want to find the adjacent side. So, we will use a tan.

We use tan, sin or cos depending upon what we want to get and what they have given in the question.

For example. If they give opposite side and you want to find the adjacent side. So, we will use a tan.

Rocky said:
5 years ago

The correct answer is 61.6 so none of these is the correct option.

Seeli said:
6 years ago

Why they not use cos 30?

Lakshaya said:
6 years ago

Why be is Perpendicular to cd?

Post your comments here:

Quick links

Quantitative Aptitude

Verbal (English)

Reasoning

Programming

Interview

Placement Papers