Question

A) work out the angle of elevation from A to B in the rectangle below. Give your answer to 1 d.p.

B) Which angle fact tells you that your answer to part a is also the angle of depression from B to A?

Answer 1

a) Set your calculator to degree mode.

`\tan( \alpha ) = (330)/(155)`

`\alpha = {tan}^( - 1) (66)/(31) = 64.8`

The angle of elevation is about 64.8°.

b) Alternate interior angles are congruent.