### Home > INT2 > Chapter 8 > Lesson 8.4.2 > Problem 8-96

8-96.

Use what you know about the area and circumference of circles to answer the questions below. Show all work. Leave answers in terms of

*π*. Homework Help ✎If the radius of a circle is 14 units, what is its circumference? What is its area?

If a circle has diameter 10 units, what is its circumference? What is its area?

If a circle has circumference 100

*π*units, what is its area?If a circle has circumference C, what is its area in terms of C?

To calculate the area of a circle use *πr*^{2}, for the circumference use 2*πr*.

area = 196*π*

circumference = 28*π*

Use the formulas given in part (a). What is the radius of this circle?

100*π* = 2*πr*

Solve for the radius then use the radius to calculate the area.