Question

The penguin exhibit at a zoo has a raised circular island that is surrounded by water. The diameter of the island is 20 \text{ meters}20 meters20, start text, space, m, e, t, e, r, s, end text. One penguin swims half way around the island before hopping out.

How far did the penguin swim?
Give your answer in terms of pi.

Answer 1

10pi

Explanation:

The circumference of the island is given by the formula ...

C = πd

where d represents the diameter of the circle.

Halfway around is half the circumference, so the distance the penguin swam is ...

1/2C = (1/2)π(20 m) = 10π m

Answer 2

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Answer:

10π meters

Explanation:

The circumference of the island is given by the formula ...

C = πd

where d represents the diameter of the circle.

Halfway around is half the circumference, so the distance the penguin swam is ...

1/2C = (1/2)π(20 m) = 10π m

The penguin swam 10π meters.