1. 1. 6 Circles (Part 1) 1. Quiz Review
a) Is this polygon convex or concave? How do you know?
b) Give three names for the polygon.
c) What is happening When you assume?
d) Draw an example of vertical angles.
d) Name that shape!
e) Find the midpoint between (9,2) and (-3,7).
Graph and label the points. A G L D F

2. heart disease 1 out of 6; cancer 1 out of 7
1. Quiz Review - continue
f-h) True or false? If false, make it true by changing the underlined portion.
f) A diagonal is a line that connects any two non-adjacent vertices of a polygon.
g) A ray that divides an angle into two angles is the angle bisector.
h) An obtuse triangle has exactly one angle that’s greater than 90°.
j) Name that shape!
k) Find the midpoint between (9,2) and (-3,7).
Graph and label the points.
l) What will be the 503rd term in this sequence? -1, 1, -1, ...
m) What is the most likely way to die in America?
heart disease 1 out of 6; cancer 1 out of 7
heart disease 1 out of 6; cancer 1 out of 7

3. 3. Circle Notes
Draw and define.
A semicircle is an arc of a circle whose endpoints are the endpoints of a diameter.

4. 3. Circle Notes
A circle is the set of all points in a plane at a given distance from a given point.

5. 3. Circle Notes
The given distance is called the radius and the given point is called the center.

6. 3. Circle Notes

7. 3. Circle Notes
Diameter is the longest cord
A chord of a circle is a geometric line segment whose endpoints both lie on the circumference of the circle.

8. Tangent is a line which touches a circle at just one point.
3. Circle Notes
tangent
Tangent is a line which touches a circle at just one point.

9. 3. Circle Notes
Secant
Cord is portion of a secant
A secant line is a line that (locally) intersects the circle in two points. Cord is portion of a secant

10. 3. Circle Notes
Discuss different ways to write major and minor arcs. Note: we did a LOT of discussion here. I put up letters over every intersection and asked them to name the arcs, point to them, etc.

11. 3. Circle Notes
An arc of a circle is two points on the circle and a continuous (unbroken) part of the circle between the two points.
An arc of a circle is two points on the circle and a continuous (unbroken) part of the circle between the two points.

12. 4. Classwork
Can a chord of a circle also be its diameter? Can it be a tangent? Why or why not?
Can two circles be tangent to the same line at a point? Draw a sketch and explain.

13. 4. Classwork

14. 5. HOMEWORK
11.1 Parts of the Circle HW