CPM Homework Help : MC2 Problem 7-40

Find the missing measure(s) of each circle.

Help:

Remember:
Circumference $= 2 · π · r$
Diameter $= 2 · r$
Use these given formulas to solve for the missing information by substituting in given measurements and solving.

diameter $=$ ?
circumference $=$ ?
Answer (a):
Circumference $= 24π = 78.4$ cm

diameter $=$ ?
radius $=$ ?
Answer (b):
Radius $=30$ cm