3 years ago

The radius of a semicircle is 1 kilometer. what is the semicircle's perimeter? use 3.14 for pie.

Mathematics

1 answer:

Aleksandr-060686 [28]3 years ago

5 0

Answer:

5.14 km

Step-by-step explanation:

A semicircle is 1/2 of a circle so the perimeter is just 1/2 of the circumference

C = 2 * pi r for a circle so for a semicircle

1/2* 2* pi *r

pi*r

3.14 * 1

3.14

If we want to include the piece that closes the semicircle, we need to add the diameter

d = 2r = 2(1) = 2

2+3.14 = 5.14

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