Circle a has a diameter of 9 cm circle b has a radius of 5 cm which circle has the largest circumference and about how many centimeters larger is it

1. The diameter is twice the radius, so the diameter of Circle B is ...

... 2 × 5 cm = 10 cm

This diameter is greater than the 9 cm diameter of Circle A, so Circle B is larger and will have a larger circumference.

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2. The circumference is the product of π and the diameter. Then the difference between the two circumferences is ...

... (circle B circumference) - (circle A circumference) = π·(10 cm) - π·(9 cm)

... = π·(10 -9) cm = π·1 cm ≈ 3.14 cm

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