Aptitude - Height and Distance - Discussion

Here AP needs to be find so using the AB value Tan 30 is taken and Root 3 is 1.73 so the answer will be 173m.

Here AP needs to be find so using the AB value Tan 30 is taken and Root 3 is 1.73 so the answer will be 173m.

But tan30 is 1 by root 3. Then how will 100 by root 3 becomes 173?

Why we are using TAN instead of using COS?

@Aswin.

We using tan because using the formula of TAN we can solve the solution easily.

Easy solution with clear explanation, Thank you.

If we use sin 30 then answer will be 200, so how can I identify for correctly tan 30?

P = Perpendicular, H = Hypotenuse, B = Base.

P - B - P
H - H - B
SIN - COS - TAN

Remember this above pattern to know what to use.

For example, in the given question we were given AB (Perpendicular) and angle BPA.
We are asked to find PA (Base).
So we have to find the relation in which both (i.e; perpendicular and base includes).
Since Tan includes Perpendicular and Base both thus we will use it.

Tan30 = Perpendicular/Base,
Tan30 = AB / PA,
Tan30 = 100 / x,
1/root(3) = 100 / x,
x = 100 * root(3),
x = 100 * 1.73,
x = 173m (Ans).

Why can we use tan instead using sin or cos? please tell me the solution.

100 √3 has given its clear but how to calculate √3 value?

Please explain it.