21. What is the perimeter of the field shown?

(T=*/)

90m

35m

A. 290m

C. 420m

B. 310m

D. 400m

This is simple with any shapes.

Perimeter is equal to the sum of all sides.

In this case the length and breadth is given, this is a rectangle.

So the other 2 sides remaining is an exact replica of these sizes "90 and 45"

So the sides are " 90, 90, 45, 45" respectively.

The perimeter thus is sum of all of these

= (90 + 90) + (45 + 45)

=180 + 90

Perimeter is = 180 + 90

Thus 270m