Question

1. Find the circumference of a circle with a radius of 12 cm. Round decimal answer to the

hundredths place value.
a. 37.70
b. 75.40
C. 18.85
d. 56.55

Answer 1

b. 75.40

Explanation:

Circumference = 2pi × r

= 2pi × 12

= 24pi

= 75.39822369

Nearest hundredth: 75.40 cm

Answer 2

b. 75.40

Explanation:

The circumference of a circle is the perimeter of the circle. To find the perimeter we would use the formula ⇒ 2 × π × r ⇔ or π × d ← where r is the radius and d is the diameter .

So lets substitute in the values

2 × π × r

Radius = 12

2 × π × 12 = 24 π = 75.3982236862

So the answer is b. 75.40