Question

find the area of a circle whose
a) diameter is 21m
b) radius is 7m

please answer my question​

Answer 1

Answer:

Area of circle is pie*r2

Step-by-step explanation:

So,

22/7×21/2×21/2 = 31.5

b) 22/7×7×7 = 154cm2

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Answer 2

Answer:

area of circle is π×r×r.

a) diameter = 2×r

r= 21/2

area= 22/7× 21/2× 21/2

=346.5 m square.

b) radius= 7m

area= 22/7× 7 ×7

=154 m square.