Question

a
4. If top of the church of height ‘h' is observed from a point at a distance
'd' in 'alpha 'angle, then express the relation among h, d and alpha​

Answer 1

sin(alpha) = h / d

1. As shown in the image below, the church is situated at a height 'h' above the ground and the observer is standing at a distance 'd' in angle 'alpha'.
2. According to the trigonometric functions, sin of the angle(here alpha) is defined as the ratio of the length of side opposite to the angle(alpha) to its hypotenuse(side opposite to right angle).