Question

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Answer 1

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We are asked to calculate the circumference of the two circles; all the required information is given to us.

$\triangle~\fbox{\bf{KEY:}}$

• The formula for the circumference is: $\mathrm{C=\pi d}$.

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In this formula,

$\star~\mathrm{C=Circumference; \\ \pi =pi,\;which\;is\;3.14; d=diameter}}$

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Question #1

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                                    Circumference of Circle

Given value(s):

• Diameter, d: 10 cm

So to solve for circumference, we should substitute 10 for y, which gives us:

$\mathrm{C=10\pi}$

Circumference:

$\bigstar~\mathrm{\underline{C=31.4\:cm}}$

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Question #2

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This time, the diameter is 6 units. We follow the same steps to find the circumference:

$\mathrm{C=6\pi }$

Upon multiplication,

$\bigstar~\mathrm{\underline{C=18.8\:cm}}$

Hope it helps you out! :)

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