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
5 cm because 5 is half of 10
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