20; the diameter of a circle is twice its 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)
The radius is 1/2 of the diameter, so if the radius is 20 units then the diameter is 40 units. You multiply the radius by 2 to get the diameter.
20 mm. The diameter is always twice the radius.
Diameter of the circle: 2 times 10 = 20 in
The radius is half the diameter. The diameter is twice the radius. If the radius is 10 inches, the diameter is twice that, or 20 inches. The radius is any straight line that connects a point on the circle with it's center. The diameter is a line segment that connects two points on a cirle throught the center of the circle.Answer:Let r be the radius of the circle and d be the diameter of the circle. We know that the diameter = 2 * radius of the circle. Given the radius r = 10 inches. Diameter d = 2 * 10 Diameter = 20 inches.
10 cm
The Answer is 20cm because you divide the diameter by 2 and then it should be your answer EX: 20/2=10, 102= Radius
The radius of a circle is half the length of its diameter. Therefore, if the diameter of a circle is 20 inches, the radius would be half of 20, which is 10 inches. The formula to find the radius of a circle is radius = diameter / 2. So in this case, the radius would be 10 inches.
20 cm
20 cm
Radius = Diameter/2 so if diameter = 20 Radius = 20/2 = 10