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Published byBetty Marylou McLaughlin Modified over 9 years ago
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Bellwork 1.Find BE. 2.What is the midpoint of ? 3. On the (x, y) coordinate plane, M(3, -2) is the midpoint of. If the coordinate of D(5, -3), what is the coordinate of F?
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1.4a Angle Measure Students will be able to name a ray correctly, identify the vertex and sides of an angle, classify it is as acute, right, obtuse or straight, and find the sum and difference of angles.
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Ray Rays are labeled with two points Just like lines and segments. Rays have an arrow above the letters. Why?
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Angles (defn) Angles are two rays with a common endpoint. Draw This. Draw This
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Naming angles THREE WAYS Using the vertex (if no other angle shares the vertex). Using a number in the angle Using one point from one side-vertex-point from the other side (most descriptive)
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Example 1 What is the vertex of <5? What is vertex of <8? Name the sides of <1. Name the sides of <2. Name <3 another way. Name <6 another way.
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Classify (with partner) Match the correct word to its definition: 1.RightA. measure greater than 90 degrees 2.StraightB. Measure equal to 90 degrees 3.AcuteC. Measure equal to 180 degrees 4.ObtuseD. Measure less than 90 degrees
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Example 2 Classify each angle as right, obtuse, acute or straight. a. b. c. d. e. f. g.
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Example 3
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Example 4
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Example 5 If and, what is the measure of ?
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Angle Bisector (Defn) A ray that divides an angle into two congruent ( ) angles is an angle bisector. Draw this. Draw this
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Ticket To Leave
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Homework Worksheet Quiz Friday over 1.4 – 1.5
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