Two-Dimensional Geometry — Test

Question 24 • Grade 7 Mathematics

The diameter of a circle is 4 cm. Which equation can be used to find its circumference?

Answer

cap c is equal to pi times 4

cap c is equal to pi times 2

cap c is equal to the fraction with numerator pi times 4 and denominator 2

cap c is equal to the fraction with numerator pi times 4 and denominator 4

Explanation

The circumference of a circle is C = πd, where d is the diameter. With a diameter of 4 cm, the equation is C = π × 4. Choice A gives this equation; the radius-based formula would use 2πr, not π × 2 alone.

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