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

Question

Mathematics

Jordin Carter

15 November, 02:51

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

+2

Answers (2)

Know the Answer?

Selina Mayer · Answer 1

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.

Zayne Moreno · Answer 2

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