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2 years ago

8

The radius of a circular track is 0.2 mile. Ellie ran around 3 times. How many kilometers did she run

1 answer:

My name is Ann [436]2 years ago

6 0

Circumference = 2πr
So the circumference of the track is C = 2π .2 or .4π
3 times around the track is .4π x 3 or 1.2π - this is the answer but most teachers will want you to use 3.14 for pi.
so 1.2 x 3.14 = 3.768 km

Do you notice that I waited until the end to use the actual value of pi (3.14) in my calculations.
Keeping things in pi units until the very end saves time.

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