Math CentralQuandaries & Queries


Question from Confused, a student:

What is the formula for the perimeter of a semi-circle?
Can you please help me out!!!
I need this answer by tomorrow.

Hi there.

If you add the length of the curved part of the semi-circle to the straight part, you will have the perimeter.

The perimeter of a full circle is its circumference. Do you know how to find a circumference? If so, then divide by two to get the curved part of your answer.

The straight part is the diameter, which is twice the radius.

Add it together to complete your answer.

Stephen La Rocque.

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