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Sveta_85 [38]
2 years ago
5

The circumference of a circle is 87 cm. What is the DIAMETER of the circle?

Mathematics
2 answers:
harkovskaia [24]2 years ago
4 0

Answer:8 cm

Step-by-step explanation:

Basile [38]2 years ago
4 0
I think the answer is 8cm
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Answer:

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Step-by-step explanation:

This requires that you use a proportion.

a / (a + 15) = 40 / 60

The small triangle's sides are in proportion to the large triangles sides.

Reduce the right. Divide top and bottom by 20

a/(a + 15) = 40/20 // 60/20

a/(a + 15) = 2/3                    

Cross multiply

3a = 2(a + 15)            Remove the brackets on the right.

3a = 2a + 30

Subtract 2a from both sides

3a-2a = 30

a = 30

Find B

b is done exactly the same way.

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