Question

the radius of a circle is 7 cm . find its circumference and area. what will happens to its circumference and area if the radius is trippled

Answer 1

Answer:

circumference=2πr

=2*22*7/7

=44cm

area=πr^2

=22*7*7/7

154cm^2

if radius is 21

then. circumference=132cm

area=1386cm^2

Answer 2

Answer:

Radius= 7 cm

so , according to the question

circumference = 2×22/7×7 =44cm

Area = 22/7×7×7 = 154sqcm.

done