Rimdiameter Sidewall Width TireA 15in. 4.60 in. TireB 16in. 4.43 in. TireC 17in.

Question

                     Rimdiameter                          Sidewall Width

TireA                15in.                                           4.60 in.

TireB                 16in.                                          4.43 in.

TireC                  17in.                                         4.33 in.
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Question 1=Find the diameter of each automobile tire.

Question 2= A student determines that the circumference of a tirewith a rim diameter of 15 inches and a sidewall width of 5.5 inchesis 64.40 inches. Explain the error!

Explanation / Answer

To find the diameter of the tire, add two times the sidewallwidth to the rim diameter. The sidewall wraps around thewhole rim, but the width is only one side of it. Tire A. 15in + 2*4.60in = 24.2in Tire B. 16in + 2*4.43in = 24.86in Tire C. 17in + 2*4.33in = 25.66in Start by dividing the circumference by to get thediameter. 64.40/= 20.5 The actual diameter should be 15in + 2*5.5in, or 26in. However, the student in question 2 added 15in and 5.5in, and didnot multiply the sidewall width by 2. 15in + 5.5in = 20.5in

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