California Assessment of Student Performance and Progress (CAASPP) Math Practice Exam

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Which of the following is half the length of the diameter?

  1. Radius

  2. Chord

  3. Diameter

  4. Perimeter

The correct answer is: Radius

The radius is indeed defined as half the length of the diameter. In a circle, the diameter is the longest distance across the circle, passing through the center, while the radius extends from the center to any point on the circle. Therefore, since the radius is precisely defined as half of the diameter, it effectively conveys the relationship between the two measurements. The chord is any line segment with both endpoints on the circle, but it does not specifically relate to half of the diameter. The diameter is the full length across the circle, and the perimeter typically refers to the total distance around the circle, known as the circumference, which is not directly related to the question about the diameter. Therefore, considering this relationship, the radius is the correct and fitting choice.

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