# The radius of the circle is 4 cm, which is equal to the diameter of this circle.

June 29, 2021 | education

| In order to find out what the diameter of a circle is, if you know its radius, you should remember the rule.

According to this rule, the diameter of a circle is equal to the sum of two radii of a given circle or two radii.

Let’s write down the formula.

D = 2R, where D is the diameter of the circle and R is its radius.

Now let’s write down and calculate.

D = 2R.

D = 2 × 4.

D = 8 (cm).

Answer: 8 cm.

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