Question

the circumference of a circle with diameter 12 is
select one:
a. 37.68
b. 78.56
c. 113.04
d. 452.16

the diameter of a circle fits around the circle ______ times.
select one:
a. 2
b. 5
c. pi
d. 10

Explanation:

Step1: Recall circumference formula

The formula for the circumference of a circle with diameter $d$ is $C = \pi d$.

Step2: Substitute diameter value

Substitute $d=12$ and use $\pi \approx 3.14$:
$C = 3.14 \times 12$

Step3: Calculate the result

$C = 37.68$

Step4: Analyze the second question

The circumference $C = \pi d$, so $\frac{C}{d} = \pi$, meaning the diameter fits around the circle $\pi$ times.

Answer:

1. a. 37.68
2. c. pi