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