Question

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?

Answer 1

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}`