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Subjects>Math>Math & Arithmetic

What is the diameter of a circle 66 inches in circumference?

Anonymous

∙ 13y ago

Updated: 10/25/2022

21 inches

Wiki User

∙ 13y ago

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Q: What is the diameter of a circle 66 inches in circumference?

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What is the circumference of a circle with a radius of 66 inches?

Circumference = 3.14 x diameter Diameter = radius x 2 So...... 3.14 x 132 = 414.48

What is the diameter if the circumference is 66 inches?

21 inches

What is the circumference of a 21-inch circle?

The circumference of a 21-inch circle is: 66 inches.(C = d x Pi).

What is the circumference of a 21-inch circle how can solve?

By a 21-inch circle I presume you mean that the diameter is 21 inches. So the radius is half as long, 10.5 inches. The formula for the circumference of a circle is 2 pi r, where r is the radius. Pi is about 3.14. That is accurate to 2 decimals, or 3 significant digits all together. I use that approximation because the dimension we are given has 2 significant digits. So the circumference is pi times the diameter; we multiply 3.14 by 21 inches and get 65.94. To 2 significant digits, that is 66 inches. If you meant that the radius was 21 inches, then the circumference would be twice as much, or 132 inches.

What is the radius of a circle when the circumference equals 66?

The radius is 10.5

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