Estimate the area of the circle. Use
22
7
for
π
.
r = radius , d = diameter
A = r² π or A = d² π / 4
so
A = 22 / 7 r² π
or
A = 22 / 7 d² π / 4
A = 22 / 28 d²
22
7
for
π
.
A = r² π or A = d² π / 4
so
A = 22 / 7 r² π
or
A = 22 / 7 d² π / 4
A = 22 / 28 d²