Question

Which is the best estimate of the circumference of this circle with the radius of 1.5units?

A. 1.5 units
B. 3 units
C. 30 units
D. 9 units

Answer 1

9 units

Explanation:

Circumference of a circle =
`2\pi r`

= 2 * 3.142 * 1.5units

= 9.428units

≅ 9 units

Answer 2

9

Explanation:

c=2(3.14)r

c=2(3.14)(1.5)

c=9.42