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Q: If the diameter is 10cm what is the radius?

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diameter=10cm radius=5cm

Radius = diameter/2 = 5 cm

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

10cm

20 cm

20 cm

Divide the diameter by 2. Diameter/2=Radius. Example: Diameter is 10cm then Radius is 10/2=5. - learnthetechnology.blogspot.com

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

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

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)

10cm or 0.05meters

If your radius is 10cm the circumference is: 62.8 cm

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