Question

Find the diameter of a circle whose area is 38.5 ms square

Answer 1

area of circle = pie × r^2

38.5 = 22/7 × r^2

r^2 = 38.5 × 7 /22

r^2 = 12.25

r = 3.5 m

d = 2r

= 2 × 3.5

= 7 cm

Answer 2

hiii!!!

here's ur answer...

area of the circle given = 38.5m²

therefore πr² = 38.5m²

==> 22/7×r² = 38.5m²

==> r² = 38.5/1×7/22

==> r² = 269.5/22

==> r² = 12.25

==> r = √12.25

==> r = 3.5m

VERIFICATION:-

area of the circle = πr²

= 22/7×3.5×3.5

= 269.5/7

= 38.5m²

hence verified

thus the radius of the circle is 3.5m.

we know that the diameter of a circle is double of it's radius. therefore diameter of the circle will be = 3.5 × 2 = 7cm

hope this helps u..!!