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What is the circumference of a circle with a diameter of 21 cm? Approximate using π = 22/7.

A. 7 cm
B. 33 cm
C. 66 cm
D. 132 cm

Sagot :

GinnyAnswer
To find the circumference of a circle, we use the formula:

[tex]\[ \text{Circumference} = \pi \times \text{Diameter} \][/tex]

Given the diameter of the circle is [tex]\( 21 \)[/tex] cm and the approximation [tex]\(\pi = \frac{22}{7}\)[/tex]:

[tex]\[ \text{Circumference} = \frac{22}{7} \times 21 \][/tex]

First, notice that [tex]\( 21 \)[/tex] can be simplified in the fraction:

[tex]\[ \frac{22}{7} \times 21 = 22 \times 3 = 66 \][/tex]

Thus, the circumference of the circle is [tex]\( 66 \)[/tex] cm.

Among the given options, the correct answer is:

[tex]\[ \boxed{66 \, \text{cm}} \][/tex]
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