Find the area of a circle if its radius is 5 cm.

A circle is a locus of points in a plane equidistant from a given point, which is called the center of a circle.

Let’s write a formula for calculating the area of a circle:

S = π R²,

where S is the area of the circle, R is the radius of the circle, π = 3.14.

We calculate the area of a circle, substituting the value of the radius and the constant π into the formula:

S = 3.14 × 5² = 3.14 × 25 = 78.5 cm².

Answer: the area of the circle is 78.5 cm².