Carrie calculated that the saucer for her teacup has a circumference of 18.84 centimeters. What is the saucer's area?

Answer 1

If the circumference is 18.84 cm, and C = 2 π r, then r = 18.84/(2 π) = 3

If r = 3 and A = π r² then A = 9π or approximately 28.26 cm²

Answer 2

Using pi=3.14 as we're good to 2 digits,

C = pi * diameter

18.84 = pi * diameter

18.84/ pi = diameter

18.84/ 3.14 = diameter

6 = diameter

3 = radius

Area = pi * radius^2 = 3.14 * 3^2 = 3.14 * 9 = 28.26