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777dan777 [17]
3 years ago
12

Find the diameter of a circle with an area of 74 square millimeters

Mathematics
1 answer:
KatRina [158]3 years ago
7 0

Answer:

The diameter of the circle is 9.7mm

Step-by-step explanation:

The area of a circle is given by the following formula:

A_{c} = \pi r^{2}

In which r is the radius.

In this problem, we have that

A_{c} = 74 mm^{2}

So

74 = \pi r^{2}

r = \sqrt{\frac{74}{\pi}}

r = 4.85mm

The diameter is twice the radius:

So

d = 2r = 2*4.85 = 9.7

The diameter of the circle is 9.7mm

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