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- The Men's Size 7 regulation Basketball has a circumference between 29.5-30 inches. It weighs 20-22 ounces, and has a diameter of 9.39 inches.
- The Women's Size 6 regulation basketball has a circumference between 28.5 and 28 7/8 inches. It weighs 17.5-19.5 ounces and has a diameter of 9.07 inches.
- The Junior's Size 5 basketball has a circumference between 27.25 to 27.75 inches. It weighs 16.6-18 ounces and has a diameter of 8.7 inches. It is recommended for boys and girls under 12 years old (junior league).
- The mini Size 3 basketball has a circumference between 22 to 22.5 inches. It weighs 10-11 ounces and has a diameter of 7 inches. It is recommended for small children (age 5-8)

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Q: What is the diameter circumference or radius of a basketball?

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A men's basketball has a radius of 19.3cm (7.5in) and a circumference of 76cm (30in).

Diameter = radius * 2 Circumference = pi * diameter.

Circumference is pi times diameter. Diameter is circumference divided by pi. Diameter is twice the radius. Radius is half the diameter.

Diameter = circumference/pi Radius = circumference/2*pi

The diameter is (the circumference) divided by (pi) . The radius is 1/2 of the diameter.

If you know the circumference, the ration of the diameter to the circumference is π, so diameter = circumference/π If you have the radius, diameter = 2 x radius

circumference: Pi(3.14) x radius squared Diameter: radius squared radius: diameter divided by 2

If you have the circumference: circumference = (pi) * diameter diameter = circumference / (pi) If you have the area: area = (pi) * radius * radius radius = square_root(area / pi) radius = diameter / 2 diameter = 2 * square_root(area / pi)

Circumference = Diameter multiplied by Pi Diameter = Circumference divided by pi Radius = Diameter divided by 2.

If you know the radius, then Diameter = 2 x (radius) Circumference = (pi) x (diameter) or Circumference = 2 x (pi) x (radius)

Circumference = 2*pi*Radius Diameter = 2*Radius Circumference = pi*Diameter

Circumference = (pi) x (diameter) Diameter = 2 x radius

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