Elspeth knows that pi times r almost equal to 9 point 4 2 cm. What would she need to do to find the circumference?

The circumference formula is C = 2πr. Since πr is approximately 9.42 cm, multiply that value by 2: C ≈ 2 × 9.42 = 18.84 cm. So she should multiply 9.42 by 2, as choice C says.

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