Find the circumference of a circle having radius 7 cm. Use π=22/7.
44 cm
To find the circumference of a circle, we use the formula:
\(C = 2 \pi r\)
where \(C\) is the circumference, \(\pi\) is a constant approximately equal to 3.14159, and \(r\) is the radius of the circle.
In this question, we are given:
- Radius \((r) = 7 \, \text{cm}\)
- \(\pi = \frac{22}{7}\)
Substituting these values into the formula, we get:
\(C = 2 \times \frac{22}{7} \times 7\)
First, simplify the multiplication:
- \(\frac{22}{7} \times 7 = 22\) (since the 7's cancel out)
Therefore, the calculation becomes:
\(C = 2 \times 22 = 44 \, \text{cm}\)
Hence, the circumference of the circle is 44 cm.
This corresponds to the correct option.
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- What is the perimeter of an equilateral triangle with side 13 cm?
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Take $\pi = \frac{22}{7}$
