Question

Smile face is 40 cm². Find its circumference

Answer 1

Answer:

Taking π=22/7

40 cm² means that it is the area of smile face i.e..

πr²=40

22/7×r²=40

r²=40×7/22

r²=12.72

r=√12.72

Circumference of smile face=2πr

=2×22/7×√12.72

=22.41 cm