Multiple choice

\text{The radius of a circle is equal to the side of a square whose area is } 196 \text{ cm}^2. \text{ What is the diameter of the circle?}

  1. $21 \text{ cm}$
  2. $18 \text{ cm}$
  3. $28 \text{ cm}$
  4. $13 \text{ cm}$
  5. $10 \text{ cm}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Area of square = 196 cm², so side = √196 = 14 cm. Radius = 14 cm. Diameter = 2 × radius = 2 × 14 = 28 cm. The key is finding the side length from the area first, then using the relationship between radius and diameter.

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