A circle has a diameter of ten millimeters. What are the circumference and area of the circle? Use three point one four for pi. Round to the nearest tenth.

A.fifteen point seven millimeters; seventy-eight point five square millimeters B.thirty-one point four millimeters; seventy-eight point five square millimeters
C.fifteen point seven millimeters; three hundred fourteen point zero square millimeters
D.thirty-one point four millimeters; three hundred fourteen point zero square millimeters

Question

A circle has a diameter of ten millimeters. What are the circumference and area of the circle? Use three point one four for pi. Round to the nearest tenth. 

A.fifteen point seven millimeters; seventy-eight point five square millimeters B.thirty-one point four millimeters; seventy-eight point five square millimeters 
C.fifteen point seven millimeters; three hundred fourteen point zero square millimeters 
D.thirty-one point four millimeters; three hundred fourteen point zero square millimeters

jhonyy9 · Answer

diameter = 10 mm so this mean that radius = diameter /2 = 5 mm

circumference = 2*pi * r = ...

area = pi*r^2 = ...

hope this will help you