This document provides information about circles and circumference. It defines a circle as all points equidistant from a center point and lists the parts of a circle as the center, radius, diameter, chord, and circumference. It gives examples of naming circle parts and using the circumference formula C=2πr to solve problems finding circumference given radius or diameter or to find radius or diameter given circumference. Students are assigned homework problems from their textbook on these concepts.

1. SECTION 10.1
Circles and Circumference

2. CIRCLES AND CIRCUMFERENCE
 What are the parts of a circle?
 How can I solve problems using circumference?

3. CIRCLE
 Circle: The locus of all points in a plane equidistant
from a given point called the center of the circle.

4. PARTS OF A CIRCLE

L

5. PARTS OF A CIRCLE

M
L

6. PARTS OF A CIRCLE


7. PARTS OF A CIRCLE

H
G

8. EXAMPLES
1. Name the circle
2. Name a radius
3. Name a chord
4. Name a diameter

9. EXAMPLE


10. EXAMPLE


11. EXAMPLE


12. CIRCUMFERENCE


13. EXAMPLE
1. Find C if r = 13 inches
1. Exact=
2. Approximate =
2. Find C if d = 6 mm
3. Find d and r to the nearest hundredth if c = 65.4
feet.

14. HOMEWORK
 Page 526
 16 - 55

15. LESSON PLAN
 Intro
 Circles!
 Standards-
 Supplies – slides, whiteboard, note sheets
 Timing: Day 1 with notes and homework. A second
day will be review and a third with a quiz.
 Essential Questions- slides 2
 Input-slides 3-7 and 12
 Guided Practice – slides 8-11, 13
 Independent Practice – Book Work