Find the circumference

Please help

area = 147 cm²

circumference = 42 cm

Explanation:

area of a circle = r²

area = 3 × 7²

= 49 × 3

= 147 cm²

circumference of a circle = 2 r

circumference = 2 × 3 × 7

= 42 cm

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate