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What is half of 4.2

Q: What is diamerter of a circle with a 4.2 cm radius?

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In the case of a circle, or spehere, the diameter is twice the radius.

Area = pi*42 = 50.26548246 or about 50 square cm

If the circumference of a circle is 12 cm the radius is: 1.91 cm

A circle with a radius of 0.5 cm has a circumference of 3.14 cm.

A circle with a radius of 208 cm has a circumference of 1306.9 cm

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264 cm

In the case of a circle, or spehere, the diameter is twice the radius.

Area of a circle = pi x (radius)2So, if the radius is 4 cm, the area is pi x 42= 50.265 cm2

Area = pi*42 = 50.26548246 or about 50 square cm

If it is a 7.1 cm radius circle, then its radius is exactly 7.1 cm!

The radius of the circle is: 9.549 cm

The radius of a 2 cm circle is: 1 cm

1/2*3.14*42 =25.12 sq.cm if the radius is 4 cm

The diameter of a circle is twice its radius. Thus the radius of a circle is half its diameter. → a circle with a diameter of 15 cm has a radius of 15/2 cm = 7.5 cm

If a circle has a circumference of 16 cm then the radius is about: 2.546 cm

If the diameter is 12 cm the radius is 6 cm.

The diameter of a circle is double the radius. So a circle with a radius of 7 cm has a diameter of 14 cm.