Question

Diameter and Radius Find the missing diameter/radius. Find the diameter of the circle if it's radius is…. a) 4.3 cm b) 12 feet c) 8.25 km d) 21 2/3 meters e) 5 in Find the radius of the circle if it's diameter is… a) 90 meters b) 22.8 cm c) 19 feet d) 12.5 km e) 64 in.

Answer 1

The diameter of a circle is twice the radius. Therefore, you can find the diameter if the radius is given by simply doubling the radius. If you want to find the radius given the diameter, simply divide the diameter by 2.

Step-by-step explanation:

The radius and diameter of a circle are directly related. The diameter is twice the radius. If the radius is 4.3cm, then the diameter is 2 * 4.3 = 8.6cm. Similarly, for a radius of 12 feet, the diameter is 24 feet. For a radius of 8.25 km, the diameter is 16.5 km. For a radius of 21 2/3 meters, the diameter is 43 1/3 meters. For a radius of 5 inches, the diameter is 10 inches.

On the flip side, if you know the diameter and want to find the radius, just divide by 2. For a diameter of 90 meters, the radius is 45 meters; for a diameter of 22.8 cm, the radius is 11.4 cm; for a diameter of 19 feet, the radius is 9.5 feet; for a diameter of 12.5 km, the meters is 6.25 km; and, for a diameter of 64 in, the radius is 32 inches.

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