Let's say that the diameter was 1/2 mile. So the diameter is 1/2, then you need to find the circumference, aka perimeter of the circle. So 1/2 times 3.14 = 1.57 miles So then you would do 1.57/2 = .785 of an hour If you round to nearest tenth The answer is .8 of an hour.
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It might be 10 but tell me if I'm right or wrong
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I have send u picture
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I think this will help u
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The first triangle is larger
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(1/2)(8)(10)=40
(1/2)(5)(13)=32.5