If a circle's diameter is d, what is its radius?

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Master the Certify Teacher EC-6 (391) Mathematics Test. Use flashcards and multiple choice questions with explanations. Boost your confidence and excel in your exam!

Multiple Choice

If a circle's diameter is d, what is its radius?

Explanation:
Radius is half the diameter because the diameter passes through the center and is made up of two radii laid end to end. So if the diameter is d, the radius is d divided by 2. For example, if d = 6, the radius is 3. The other options don’t fit: d would be the full across distance, not half; 2d would be twice the diameter, not a radius; and sqrt(d) isn’t related to the circle’s basic measurements.

Radius is half the diameter because the diameter passes through the center and is made up of two radii laid end to end. So if the diameter is d, the radius is d divided by 2. For example, if d = 6, the radius is 3.

The other options don’t fit: d would be the full across distance, not half; 2d would be twice the diameter, not a radius; and sqrt(d) isn’t related to the circle’s basic measurements.

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