(Q12) You want to erect a pole of height 10 m with the support of three ropes. Each rope has to make an angle 30o with the pole. What should be the length of the rope?

Solution :

Height of the pole = 10 m

Let the length of each rope = x

Angle made by the rope with the pole = 30o

x30o10 cm

From the figure

cos ° =
x
=
x
x =
∴ Length of each rope =
∴ Total length of the rope = 3 ×

= m