Answer:
10 cm
Explanation:
The diameter is a chord (line) that connects on both ends of a circle which includes the center point of the circle. The radius comes from the center point of the circle to one end of the circle.
Diameter is therefore 2 radii (radius).
So if diameter is given and you want to find the radius, divide it by two to find the answer.
20 ÷ 2 = 10 cm