Question

Determine (a) the area and (b) the circumference of the circle.

Answer 1

Step-by-step explanation:

a).

To find the area of the circle we must first find the radius using the formula

radius = diameter / 2

From the question

diameter = 21 ft

The radius is

21/2 = 10.5 ft

Area of a circle = πr²

where r is the radius

Area = π(10.5)²

= 110.25π

= 346.36 cm²

b).

Circumference of a circle = πd

where d is the diameter

Circumference = π(21)

= 65.97cm

Hope this helps you