Question

Find the circumference and area of a circle with a diameter of 22 inches. Leave your answers in terms of pi.

Answer 1

Answer: d. C = 22π   ; A = 121π

Step-by-step explanation:

Circumference of a circle with diameter d is given by :-

$C=\pi d$

Given: Diameter of circle = 22 inches

Therefore, the circumference of circle is given by :-

$C=\pi (22)=22\pi$

Area of circle: $A=\pi r^2$, where r is radius of circle.

Since diameter = 22 inches, then radius = 11 inches   [Half of diameter]

Now, Area of circle: $A=\pi (11)^2=121\pi$

Answer 2

The circumference formula is 
C=Diameter x π=22 x π, the area formula is A=π x R²
or R=D/2=22/2=11

the answer is d. C = 22π; A = 121π