The radius of a circle is the distance from the center to any point on the circumference. The diameter is the distance from one side of the circle's circumference, through the center of the circle, to the opposite side.
18 yards
Practice makes perfect
We want to find the diameter of the circle given its radius. Let's recall the definitions of radius and diameter.
Radius: Distance from the center of the circle to any point on the circumference.
Diameter: Distance from one side of the circle's circumference, through the center of the circle, to the opposite side.
We are told that the radius is 9 yards. According to the definitions, the diameter is twice the radius. Let's multiply the radius by 2!
9* 2 = 18
This means that the diameter is 18 yards.
