Question

Find the perimeter of the semicircle. Use pi ≈ 3.14.

Answer 1

38.55cm

Step-by-step explanation:

formula for circumference of a circle: π x D

D = diameter

Therefore, formula for the circumference of a semi-circle = (π x D) / 2

3.14 x 15 = 47.1cm

halve this because half of a circle is a semi-circle.

47.1 / 2 = 23.55

This is the curved measurement of the semi-circle.

To find the total perimeter, we need to add on 15cm.

23.55 + 15 = 38.55cm

Hope this makes sense!

Answer 2

Answer: 38.55 cm

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Step-by-step explanation:

A full circle has a circumference of

circumference = pi*(diameter)

C = pi*d

C = 3.14*15

C = 47.1

But we only want half of the circle, aka semicircle.

(47.1)/2 = 23.55

This handles the distance around the curved edge of the semicircle.

Then add on the straight line portion of 15 cm to get 23.55+15 = 38.55 cm

This answer is approximate since pi = 3.14 is approximate.