Solve the following problems using what you learned last week about the relationship between radius, diameter and circumference. Write your answer in terms of pi AND solve using 3.14 forπ.
ex. What is the circumference of a circle whose diameter is 23cm? C=23π or C=72.2cm.
1. Marcus is helping his coach design an obstacle course for the weekend’s fitness tournament. They dug a circular water pit with a circumference of 18 feet. Marcus has to cut a balance beam that the students will use to cross the pit. The beam is going across the center of the pit. How can Marcus determine how long the balance beam should be to cover the diameter of the pit?
2. a) What is the circumference of a circle with a diameter of 10 cm?
b) What is the circumference of a circle with a radius of 20 cm?
3. What is the radius of a circle with a circumference of 30 cm?
4. Which is the best estimate for the diameter of a circle with a circumference of 92 cm?
a) 16 cm
b) 30 cm
c) 46 cm
d) 270 cm
5. If the only tool you have is a ruler, why is knowing the formula C = 2πr useful?
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