Question

Find the area of circle whose radius is i) 7 km ii) 2.1 m

Answer 1

area = πr^2
i)π=22/7
=22×7×7/7
=154 km. sq.
ii)22×2.1×2.1/7
=13.86 km. sq.

Answer 2

area of circle πr square=π*7*7=154
2) 22*2.1*2.1/7=13.86