Question

How to determine area and circumference of a circle​

Answer 1

Area is pi r squared.

Twinkle twinkle little star, circumference equals 2 Pi r

Answer 2

For Area,

π r ² (pi × radius squared)

For Circumference,

2π r (2 × pi × radius)

OR

π d (pi × diameter)

Note: pi could be 3.14