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What is the best approximation for the perimeter of a semicircle with a diameter of 12 cm?

Use 3.14 to approximate pi.

A18.84 cm
B30.84 cm
C61.68 cm
D75.36 cm

PLEASE HELP!

Verified Answer :

sdmatera

First, we know that the equation for permeter of a circle is C=2pi4 or C=23.14r if you are using 3.14 for pi. Since this is a semicircle, we simply divide this equation by 2 and plug in our radius (radius id 6 because 12/2 =6)

So we are using C=3.14r
C=3.146
So the perimeter equals 18.84 so A

Hope this helps!

Noah11012

To find the circumference of a circle, we use this formula: C = (2)(pi)(r)

We'll use 3.14 for pi. And the radius is one half of a diameter.

C = (2)(3.14)(6) = 37.68

Then because we want the perimeter of a semi-circle, we half it.
37.68 / 2 = 18.84


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