Question

Find radius and perimeter of a circle whose area is 77cm^2

Answer 1

bonjour dear!

area of circle = 77 cm^2

=πr^2 = 77

= (22/7) x r^2 = 77

= r^2 = (77 x 7) / 22

= r^2 = 49/2

= r = 7/√2 cm

perimeter = 2πr = 2 x 22/7 x 7/√2

= 44√2 cm

hope this helps

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