To find the areo of the circle, use the next formula A =πr²
7.
A =πr²
A =π(7mm)²
A = 49π mm²
8.
A =πr²
A =π(15.6cm)²
A =243.36π cm² = 243.4π²
Remember that the diameter is 2* radius to solve 7 and 8,
d = 2*r
so r = d/2
A =π(d/2)²
7.
A =π( 58 yd/2)²
A = 841π yd²
8.
A =π( 10.2 m /2)²
A = 26.01π m² = 26π m²