Question

The area of circle whose diameter is 21 metre

Answer 1

R=21/2
AREA OF CIRCLE=πR²
=22/7*21/2*21/2
=346.5M²

Answer 2

diameter = 21
radius = d/2
r = 10.5

area of circle =

$2\pi \:r$
=2×22/7×10.5
=2×1430/7
=1860/7
=265.71 sq.cm