# How do you change the radius so that the circumference increases 8 times?

Let’s write down the formula for determining the circumference in terms of the radius:
l = 2πR,
where l is the circumference, R is the radius, π = 3.14.
Based on the formula for the circumference of a circle, the circumference of a circle is directly proportional to the radius of the circle.
The quantities are called directly proportional if, when one quantity is increased by several times, the second quantity is increased by the same quantity.
This means that in order for the circumference to increase by 6 times, it is necessary to increase the radius of the circle by 6 times.
Answer: the radius of the circle must be increased by 6 times.

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