Question

Please helppp!! Round to the nearest hundredths

Answer 1

Answer:1385.44mm sq

Step-by-step explanation: surface area of a circle = pi x radius squared

3.142 x 21 squared

Answer 2

Explanation:

diameter = 42 mm

radius (r) = 42/2 = 21mm

SA of semicircle = 3πr²

`=3*(22)/(7)*21*21\\\\=3*22*3*21\\\\=4158mm^(2)`