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Q: What is the diameter of a circle if its radius is 10cm?

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Radius = diameter/2 = 5 cm

10cm

20 cm

it is half the diameter e.g 10cm diameter = 5 cm radius

diameter=10cm radius=5cm

10cm or 0.05meters

radius = diameter ÷ 2 ⇒ radius = 10 cm ÷ 2 = 5 cm

That depends what you mean with "a 20 cm. circle". If 20 cm. is the radius, you already have the answer. If 20 cm. is the diameter, the radius is half the diameter. (10cm)

if a radius is 5cm the diameter is 10cm rule- you double the radius

The circumference of a circle with radius of 10cm is: 62.83 cm

Take "pi" times the diameter of the circle. Pi = 3.14159 (ALWAYS) If circle has a diameter of 10cm, circumference 31.41cm If circle has a radius of 2inches, the circumference is 12.57 inches. (radius = 2, diameter = 4)

The diameter of a circle is twice its radius

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