Find the circumference and area of a circle if the radius is 4 cm.

To solve this problem, we introduce a conditional variable “X”, through which we denote the circumference.

Then, applying the formula for the circumference of a circle and based on the data of the problem, we will compose the following equation: X = 2 x 3.14 x 4.

Solving this equation, we get X equal to 25.12 centimeters.

Therefore, the area of the circle will be 3.14 x 4 x 4 = 50.24 cm2.

Answer: the circumference is 25.12 centimeters, the area of the circle is 50.24 cm2.