Question

it means that circumference of semi circle is different it only include the circular part? ​

Answer 1

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The perimeter of a semicircle is the sum of the half of the circumference of the circle and diameter. As the perimeter of a circle is 2πr or πd. So, the perimeter of a semicircle is 1/2 (πd) + d or πr + 2r, where r is the radius.

Answer 2

Answer:

Yes.

I have answered with full explanation in your last question.

hope it helps.