20304

Question

A child's bike tyre has a circumference of 90 cm.

Which of these is closest to the radius of the circle?

Worked Solution
CC = 2πr\large \pi r
90 = 2 × π ×r\times\ \large \pi\ \times \large r
r\large r = 902π\dfrac{90}{2\large \pi}
≈902×3.14\approx \dfrac{90}{2\times 3.14}
≈906.3\approx \dfrac{90}{6.3}
≈\approx {{{correctAnswer}}} (closest answer)

Variant 0

DifficultyLevel

627

Question

A child's bike tyre has a circumference of 90 cm.

Which of these is closest to the radius of the circle?

Worked Solution
CC = 2πr\large \pi r
90 = 2 × π ×r\times\ \large \pi\ \times \large r
r\large r = 902π\dfrac{90}{2\large \pi}
≈902×3.14\approx \dfrac{90}{2\times 3.14}
≈906.3\approx \dfrac{90}{6.3}
≈\approx 14.3 cm (closest answer)

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
correctAnswer
14.3 cm

Answers

Is Correct?Answer
x

5.4 cm

✓

14.3 cm

x

28.6 cm

x

141.4 cm