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Jamie made a semicircular pendant with a radius of 4 centimeters to use on a key chain. She attached a wire around the edge of the pendant.What is the approximate length of the wire she attached to the pendant?

User Kungfoo
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1 Answer

2 votes

The approximate length is 21 cm.

Step-by-step explanation

Finding the length of the wire implies finding the perimeter of the semicircular pendant.

To find the perimeter of the pendant, we will use the formula below:

P = 2r + πr

Where P is the perimeter of the semicircle.

r is the radius of the semicircle.

π is a constant = 22/7

From the given question, r = 4.

Substitute the values into the formula and evaluate.


P=2(4)+(22)/(7)(4)


=8+(88)/(7)


=20.5714


\approx21\text{ cm}

User Mikaal Anwar
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