Multiple choice

The circumference and area of a circle of radius 17.5 cm are, respectively

  1. $150\, cm,\, 662.5\, cm^2$
  2. $55\, cm,\, 502.5\, cm^2$
  3. $210\, cm,\, 692.5\, cm^2$
  4. $110\, cm,\, 962.5\, cm^2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Circumference = 2 * pi * r = 2 * (22/7) * 17.5 = 110 cm. Area = pi * r^2 = (22/7) * 17.5 * 17.5 = 22 * 2.5 * 17.5 = 962.5 cm^2.

AI explanation

Using the circumference formula, 2 times pi times radius gives 2 times 22 divided by 7 times 17.5, which equals 110 cm. The area formula gives pi times the square of the radius, so 22 divided by 7 times 17.5 times 17.5 equals 962.5 square cm.

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