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secondary 3 | E Maths

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How to solve part (b)

∠ PQB = arctan(23/95) or tan-¹(23/95)

∠ PQB is the angle of elevation of B from Q.

Since angle of elevation of B from Q = angle of depression of Q from B, (alternate angles, you should know this)

angle of depression of Q from B

= tan-¹(23/95)

≈ 13.6097319°

= 13.6° (1 d.p)

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For (b), angle of depression is measure from the vertical pole.