Lesson 11-6 Pages 493-495

Area of Circles

What you will learn!

How to find the area of circles.

What you really need to know!

The area A of a circle equals the product of pi () and the square of its radius r. A = r2

Radius

r

½ of the circumference

½ of 2r

rrA 22

1 2rA

Link to Pre-Made Lesson

Example 1:

Find the area of the circle:

4 cm

2rA 2414.3 A224.50 cmA

Example 2:

Find the area of the circle with a diameter of 11.6 cm.

11.6 cm

2rA 28.514.3 A26.105 cmA

Page 494

Guided Practice

#’s 4-10

Page 493 with someone at home

and study examples!

Read:

Homework: Page 494-495

#’s 11-25, 32-37

Lesson Check 11-6

Link to11-6 Review Problems

Page

591

Lesson 11-6