Answer
#4 = 153.9
#5 = 452.3
Area of a circle = Pi x radius squared
#4 Given radius of 7
Area = 3.14 x 7^2
Area = 3.14 x 49
Area = 153.86
Round to nearest tenth
Area = 153.9
#5 Given radius of 12
Area = 3.14 x 12^2
Area = 3.14 x 144
Area = 452.26
Round to nearest tenth
Area = 452.3