Mayahex4

7.4 Surface Area and Volume of Cylinders

A quarter is a right cylinder with a diameter of 24.26 millimeters and a thickness of 1.75 millimeters. Estimate the surface area of the quarter.



Formula needed to solve this: S=2(3.14)rh + 2(3.14)r

First you need to figure out the radius, which is half of the diameter. r = 12.13 Now you can plug in the your numbers in the equation: S=2(3.14)(12.13)(1.75) + 2(3.14)(12.13) Next step would look like this: S=(6.28)(21.22)+(6.28)(147.13) To break it down a little more it would look like: S=133.26+923.97 = about.. 1057.23 square millimeters.

So, the answer is: The surface area of the quarter is about 1057.23 square millimeters. =]