Solution:
The rope is 20 metres long and makes a 30° angle with the ground level.
Given here: Measure of AC = 20 m and measure of angle C = 30°
We need to Find: Height of the pole
Let the vertical pole be AB
Using the sine formula, in right angle ΔABC,
AB/AC = sin 30°
Using the value of sin 30° which is ½, we get
½ = AB/20
AB = 20/2
AB = 10
As a result, 10 m is the height of the pole.