Tennis Balls have a diameter of 2.575”-2.7” (6.54-6.86 cm) and circumference of **8.09”-8.48” (20.6-21.5 cm)**. The mass of a Tennis Ball must be between 1.975-2.095 oz (56-59.4 g).

## In this regard, what is the diameter of a ball?

We know that the diameter of a sphere is **twice the radius**. i.e., the diameter, d = 2r. From this, we get r = d/2.

**9.6110 cubic inches**.

## In this manner, what do the numbers mean on a tennis ball?

A common myth among players is that the printed numbers on the tennis balls indicate their bounciness. However, **there is neither a special code nor a meaning related to** these numbers. All tennis balls are the same within their brand.

## Is tennis ball yellow or green?

By rule of tennis law—specifically, the International Tennis Federation, or ITF—**a tennis ball should be yellow in color**. The edict was handed down in 1972, after television viewers had trouble following the movement of white balls.

## How do I know what size gym ball to get?

## How do I know what size exercise ball to get?

You will want to choose a ball size **that is proportional to your height**. The rule of thumb is that you want to be able to sit on your ball with your legs at a 90-degree angle or slightly more, but not less. Your thighs should be parallel to the ground or angled slightly down.

## How do you calculate a diameter?

**How To Calculate Diameter?**

- Diameter = Circumference ÷ π (when the circumference is given)
- Diameter = 2 × Radius (when the radius is given)
- Diameter = 2√[Area/π] (when the area is given)