Melanie wants to put ribbon around the circumference of a circular section of the city park. Ribbon comes in rolls of 40
feet. The radius of the section of the park is 100 feet. How many rolls of ribbon should Melanie buy?
Equation for circumference: ______________
Answer: ________________
16
The equation for the circumference of a circle is C = 2πr, where C represents the circumference and r represents the radius of the circle.
In this case, the radius of the circular section of the city park is given as 100 feet. Therefore, the equation for the circumference would be:
C = 2π(100) = 200π feet.
Now, to calculate how many rolls of ribbon Melanie should buy, we need to divide the circumference by the length of each roll of ribbon, which is 40 feet.
Number of rolls of ribbon = C / Length of each roll
Number of rolls of ribbon = (200π) / 40
To simplify this further, we can divide both the numerator and denominator by 40:
Number of rolls of ribbon = (5π) / 1
Since we cannot have a fraction of a roll of ribbon, Melanie should round up the result to the nearest whole number. So, she should buy:
Number of rolls of ribbon = 5π ≈ 16 rolls
Therefore, Melanie should buy approximately 16 rolls of ribbon.