Question

A circular donut has a diameter of 7 cm the circular hole in the center of the donut has a radius of 1.5cm. find the circumference of the donut

7 is the radius of the donut

7 is the circumference of the donut

7 is the diameter of the donut

Answer 1

31.4

Explanation:

To find circumference, the formula is A=pi*r^2. The radius is 1/2 the diameter. The radius of the donut is 3.5. 3.5^2 is 12.25. Pi is approximately 3.14, so 12.25*3.14 is 38.465. The donut hole takes away from the circumference, so we have to subtract the circumference of the donut hole from the donut. 1.5^2 is 2.25, and 2.25*3.14 is 7.065. 38.465-7.065 is 31.4. The circumference of the circle is 31.4.

Hope this helps!

Answer 2

Explanation:

1.5 times 1.5 when doing so u need to round it to the tenths place