Question

A small metallic washer is of 7mm radius with a hole of 3.5mm radius. what is the area of the washer

Answer 1

area of washer hole=22/7*3.5*3.5=77/2=38.5 square mm

area of washer without hole =22/7*7*7=22*7=154 square mm

Therefore, Area of the washer=154-38.5=115.5 square mm

Answer 2

Answer:

excluding hole=115.5 m²,

including hole = 192.5 ²m

Step-by-step explanation:

Area of washer(including hole)=πr²

=22/7*7*7

=22*7

=154mm²

area of hole=πr²

=22/7*3.5*3.5

=22*0.5*3.5

=22*1.75

=38.5mm²

area of washer(excluding hole)=154-38.5=115.5mm²