Find the perimeter of the given shape.
If the three sides of a triangle are 11m, 15m and 6m.What is the semi perimeter of the triangle?
Two poles of height 10 m and 18 m stand on a plane ground. If the distance between the feet of the poles is 15 m, find the distance between the top of the poles.
The length of a rectangular plot is 12m and its perimeter is 60m. Find its width.