1. Lesson: 10 – 1 Circles and Circumference
Geometry
Lesson: 10 – 1
Circles and Circumference
Objective:
Identify and use parts of circles. Solve problems involving the
circumference of a circle.

2. Circle
A set of points in a plane equidistant from a given point called the center.

3. Segments in a Circle
Copy

4. Name the circle, a radius, a chord, and a diameter of the circle.

5. Radius and Diameter

6. 16 in
7 ft
11 m

7. Circle Pairs

8. Circle Pairs
Copy all

9. How can 2 circles intersect?

10. 15 9
Find RC.

11. Copy formula
Circumference
The distance around a circle.

12. Find the circumference of each circle described
Find the circumference of each circle described. Round to the nearest hundredth.

13. Find the diameter and radius of a circle to the nearest hundredth if the circumference is 106.4 mm.
First!

14. Quadrilateral LMNP is inscribed in the circle.
Circle K is circumscribed about Quad. LMNP.

15. Do not plug into a calculator
Draw a picture.
Find the hypotenuse (diameter).
Find the circumference. 9
Do not plug into a calculator
since it said “exact”

16. Homework
Pg – 8 all, 10 – 32 E, 50