Find the circumference and area of a circle with a diameter of 18.8 cm. Round off the answers to tenths.

Given: diameter of a circle d = 18.8 cm, number n = 3.14

Let’s write down the formulas for the circumference c = 2 * n * r and the area of the circle S = n * r ^ 2, where r is the radius of the circle.

The radius of the circle is equal to half the diameter of this circle r = d / 2, then c = 2 * n * d / 2 = n * d = 3.14 * 18.8 = 59.032 = 59 cm

S = n * (d / 2) ^ 2 = n * d ^ 2/4 = 3.14 * 18.8 * 18.8 / 4 = 277.4504 = 277.5 cm2

Answer: circumference 59 cm, area of a circle 277.5 cm2 (square centimeters)