Question

find the area of a circle whose diameter is 21 mm​

Answer 1

Answer:

Area of circle is 1386 cm sq.

Step-by-step explanation:

Given, radius r = 21cm and π = 22/7

Then,

Area of the circle = πr  sq.

= 22/7 x 21 x 21

= 22 x 3 x 21

= 1386 cm sq.  

            I hope this answer will help you..........

Answer 2

Answer:

area of circle =22/7r2

diameter =21mm

radius=diametre/2=21/2mm

area of circle=22/7×21/2×21/2=346.5square metre

346.5square metre is the correct answer

I HOPE IT IS HELPFUL