Question

find the area of circles with diameter 40 cm

Answer 1

diameter is 40

so radius is 40/2

=20

area of circle is pie x r ²

=22/7 × 20 ²

22/7×400
=1257.14 cm ²

Answer 2

area of circle is Πr*2

= 22/7 × 20×20

=1257.14cmm*2