Question

Calculate the area of a circle with a radius of 2 cm and a circle with a radius of 4 cm. Leave your answers in terms of pi.

Answer 1

S = πr^2
so area of circle where r is 2cm;π=3,14 will be 
S = π*(2^2)
S=π*4
S=4π  cm2

S = πr^2
so circle  where r is 4cm;π=3,14 will be 
S = π*(4^2)
S=π*16
S=16π  cm2


the answer for second question is thet the area gets bigger 4 times if we double radius)so "yes"

ANSWER IS 
C) 4π cm2; 16π cm2; YES