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12 February, 09:42

A gear on a bicycle has the shape of a circle one gear has a diameter Of 4 inches and a smaller one has a diameter of 2 inches Justin says that the circumference of the larger gear is 2 inches more in the circumference of the smaller gear do you agree explain your answer

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  1. 12 February, 13:19
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    Justin is not correct. It is true that the diameter of the larger circle is 2 inches more than the smaller circle diameter.

    Use formula pi D or 3.14xDiameter

    Large gear:

    3.14 (4)

    =12.56 in

    smaller gear

    3.14 (2)

    =6.28

    actually, the larger gear in circumference is 6.28 more than the smaller gear. Also, 12.56/2=6.28 ... so, the larger gear circumference is 2 times the diameter of the smaller gear.

    12.56-6.28=6.28
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