Question

The diameter is { ? }
cm.
r = 5.4 cm
The circumference in terms of pi { ? } is
cm.
Using 3.14 for pi , the approximate circumference of the
circle is { ? } cm. Find the answers for the “?”’s .

Answer 1

The diameter of the circle is 10.8 cm

The circumference of the circle is 33.9 cm

Explanation:

Given that the radius of the circle is 5.4 cm

Diameter:

The diameter of the circle can be determined using the formula,

$d=2r$

where r = 5.4

Thus, we have,

$d=2(5.4)=10.8$

Thus, the diameter of the circle is 10.8 cm

Circumference:

The circumference of the circle can be determined using the formula,

$C=2\pi r$

Substituting $\pi=3.14$ and $r=5.4$, we have,

$C=2(3.14)(5.4)$

$C=33.9$

Thus, the circumference of the circle is 33.9 cm