the top of an auto piston is a circle with a diameter measuring 8.4 centimeters . what is the area of the top piston ?

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22-09-2017
Mathematics

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the top of an auto piston is a circle with a diameter measuring 8.4 centimeters . what is the area of the top piston ?

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mikaylachelene mikaylachelene · Answer 1 · 2017-09-22T17:53:09+02:00

mikaylachelene mikaylachelene

22-09-2017

Radius = Diameter /2

So, Radius = 8.4/2 or 4.2

4.2^2 = 17.64.

17.64 x pi = 55.39 sq cm.

cm because we are being consistent with the units of measurement already in use.

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musiclover10045 musiclover10045 · Answer 2 · 2017-09-22T17:53:16+02:00

musiclover10045 musiclover10045

22-09-2017

area of a circle = PI x r^2

r = 8.4/2 = 4.2

using 3.14 for PI

area = 3.14 x 4.2^2 = 55.3896 square cm

round answer as needed

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