Asked by Anonymous

A trundle wheel can be used to measure the walking distance between two locations.
a) If the diameter of a trundle wheel is 45cm, how far will a person have walked when the wheel makes one full rotation?
b) If a person walks for 0.7km, how many times has the wheel rotated?

We are currently working on measurement and conversion, I understand that measurement is involved in this question but I don't know how, when, why, and what to convert. One full rotation is 360 degrees right? I don't get how 360 degrees and 45cm go together.
Answered by DrBob222
If the diameter of the wheel is 45 cm then the radius is 45/2 = 22.5 cm and the circumference is pi*r^2. When the wheel makes one full revolution it will have traveled the circumference of the wheel.
Answered by DrBob222
Is my face red. Circumference, which is what you want, is pi*diameter. I, unfortunately, gave you the formula for the area of a circle. Bad! I get an "F" for the day.
Answered by Princess
Hello! i have the same question and i did pi*diameter (3.14*45cm) and got an answer of 141.3cm.
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