# Bike Wheel

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#### Storyboard Description

A girls bike wheel broke and she needs to find the measurements of it to get the perfect replacement.

#### Storyboard Text

• Oh No! My bike's wheel broke!
• I need to buy the right sized part, but first I need to find the measure of the outside of the wheel, called the Circumference.
• To find the circumference, you first need to know the radius. The radius is half of the measure of the diameter. The Diameter is a line from the left to the right, that divides the wheel into two equal halves.
• The diameter is 12 inches. This means that the radius must be 6 inches! Now that we know the radius, we have to multiply it by Pi (3.1415…). When using Pi, you can use the first three digits to save time!
• 6 in.
• 12 in.
• 6 x 3.14 () = 19. The exact solution is too long so I rounded up to the nearest whole number which is 19.
• 6 in.
• 12 in.
• The final step is to multiply your answer by 2 and you have the Circumference of your circle! Now that I know the circumference, I don’t have to worry about getting the wrong wheel for my bike!
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