A circle has a radius of 4 cm. Which of the following would be the diameter of the same circle?
Understand the Problem
The question asks us to calculate the diameter of a circle given its radius. The diameter of a circle is twice its radius. We are given a radius of 4 cm, so we need to determine which of the following options would be the diameter of the same circle.
Answer
8 cm
Answer for screen readers
8 cm
Steps to Solve
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Recall the relationship between radius and diameter The diameter of a circle is twice its radius.
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Calculate the diameter Given the radius $r = 4$ cm, the diameter $d$ is calculated as: $d = 2 \times r = 2 \times 4 = 8$ cm
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Choose the correct answer From the options given, 8 cm is the diameter of the circle.
8 cm
More Information
The diameter of a circle is the longest distance across the circle, passing through the center.
Tips
A common mistake is confusing the radius and diameter. Remembering that the diameter is twice the radius can help avoid this error.
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