Download 1.4 notes.notebook

1.4 notes.notebook
September 09, 2010
Go over homework with your group.
Can you have more than one correct distance answer?
Does everyone have similar answers to 56?
You have a quiz tomorrow on sections 1.1­3
basic definitions
drawing diagrams
congruent segments & algebra
distance & midpoints
Simplifying radicals like √32
Sep 7­9:12 AM
degree: Unit of measurement equal to 1/360 of a turn around a circle.
ray: a part of a line with one end point.
picture
A line can be separated into two opposite rays
Sep 7­9:26 AM
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1.4 notes.notebook
September 09, 2010
angle: formed by two rays that share a common endpoint.
picture
The rays are the sides of the angle.
side1= side2= The endpoint is the vertex of the angle. vertex=
Naming an angle
1. A number inscribed in the angle.
2. Three points with the vertex in the middle.
3. The vertex (if only one possible angle).
Sep 7­9:26 AM
Example:
What are the sides and vertex of angle 2?
What are other names for ∠JGL?
Sep 7­9:27 AM
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1.4 notes.notebook
September 09, 2010
Types of angles
Right angle ­ m∠A = 90° Acute angle ­ m∠B < 90° Obtuse angle ­ m∠C > 90° Sep 7­9:27 AM
Congruent Angles: Two angles are congruent if and only if they have the same measure.
picture Sep 7­9:27 AM
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1.4 notes.notebook
September 09, 2010
Angle Bisector: A ray that divides an angle into two congruent angles.
picture
Sep 7­9:27 AM
example
Sep 7­9:28 AM
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1.4 notes.notebook
September 09, 2010
Homework: complete the evens on the review worksheet
Friday Homework for section 1.4 page 34 #12­17, 20­23, 35, 36, 39, 44, 50, 51
Sep 7­9:28 AM
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