### Home > MC2 > Chapter 7 > Lesson 7.1.4 > Problem 7-40

7-40.

Find the missing measure(s) of each circle. Homework Help ✎

a. diameter = ? | b. diameter = ? |

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.

Circumference = 24π = 78.4 cm

Radius = 30 cm