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Find the perimeter for the figure.

Round you answer to the nearest tenth.
10 cm
30 cm
20 cm
10 cm

Find the perimeter for the figure. Round you answer to the nearest tenth. 10 cm 30 cm-example-1

2 Answers

2 votes
30cm is the diameter of the half circle, therefore the radius is d/2=30/2=15cm.

The formula for the perimeter of circle os 2pi*r, but since it is just half a circle, we divide by 2. The perimeter for the half circle is pi*r.

Then we add all of them together

P= 10+20+10+3.14*15= 87.1cm
User Sameer Ahmed S
by
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4 votes

Explanation:

A semicircle has 1/2 circumference of the full circle = 1/2 pi d

so the entire perimeter will be 1/2 ( pi)(30) + 10 + 10 + 20 = 87.1 cm

User Fabian Linzberger
by
8.9k points

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