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A circle is two semicircles put together. The circumference of a circle is the length around it, so half of that would be what you are aiming for. Let's call the circumference "c" and the radius (the straight part of the semicircle) "r". Pi is also needed in this problem, so we can use "π". The equation for the circumference of a circle is c=2πr. Replace "r" with the length of the straight part of the circle, and do the math. Divide your answer by 2.

Example:

r=2

c=2πr

c=2π2

c=4π

c=(approximately)12.57

12.57 divided by 2 equals approximately 6.29.

The length of the curved part of the semicircle is 6.29!

Hope this helps!

Q: How to find the length of the curved part of the semicircle?

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