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radius = square root of (75/pi) = 4.886025119

diameter = 2*radius = 9.772050238 or 10 mm to the nearest integer

Q: What is the diameter of a circle with a area of 75 mm?

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A circle with a diameter of 25 mm has an area of 490.9 square mm.

Area = pi*282 square mm

Area = pi*552 square mm

If the diameter of a circle is 5.4mm, then the radius is 2.7 mm. The formula for the area of a circle is PIr^2. So, the area is then 22.9 mm2.

It is: pi*12.52 square mm

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A circle with a radius of 50 mm has an area of 7853.98 square mm

Diameter of a circle is pi times the square of its radius. For a circle having a diameter of 7 mm, area = pi (3.1416) x 3.5 mm x 3.5 mm = 38.5 square millimeters.

I do not know about a circle with an area of 100 nmm3.A circle with an area of 100 mm2 has a diameter of 11.28 mm.

A circle with a diameter of 25 mm has an area of 490.9 square mm.

Area in square mm = pi*1252

Area = pi*282 square mm

Area = pi*552 square mm

A circle with a diameter of 4 mm has an area of : 12.57 mm2

Using 3.14 as Pi the area of circle is: 226.865

Area = pi*262 = 676*pi square mm