Radius = diameter/2 = 5 cm
it is half the diameter e.g 10cm diameter = 5 cm radius
Divide the diameter by 2. Diameter/2=Radius. Example: Diameter is 10cm then Radius is 10/2=5. - learnthetechnology.blogspot.com
10cm
20 cm
20 cm
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)
5 cm because 5 is half of 10
10cm or 0.05meters
The diameter of a 10 cm wide circle is 10 cm. The diameter is just how wide it is. The radius is 1/2 X diameter. 1/2 X 10cm = 5 cm.