Objective: To recognize and classify angles and

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Presentation transcript:

Objective: To recognize and classify angles and Their parts. 4.12.1 Class Notes Geometry Sec 2.1 An Angle is made of 2 rays that share a common endpoint Side 1 Vertex Side 2

There are 4 types of angles a. Acute Angle – less than 90 b. Obtuse Angle – more than 90 c. Right Angle – exactly 90 d. Straight Angle – exactly 180

Complementary Angles are 2 angles whose measures add up to 90. Do these 2 angles appear to Be complementary? Right Angle = 90 Flash 4. Determine if two angles with the measures given are complementary. b. 27 & 73 a. 30 & 60 c. 11 & 79 d. 46 & 44 f. 36 & 54 e. 2 & 88

5. Supplementary Angles are 2 angles whose measures add up to 180. Straight Angle = 180 Do these 2 angles appear to Be supplementary? Flash 6. Determine if two angles with the measures given are supplementary. b. 117 & 63 a. 30 & 150 c. 128 & 62 d. 86 & 104 f. 136 & 34 e. 2 & 178

1 & 2 are adjacent angles 7. Intersecting lines When 2 lines intersect 4 Angles are formed 2 1 1 & 2 are adjacent angles 3 4 1 & 3 are nonadjacent angles 1 & 2 are a linear pair and must = 180 1 & 3 are vertical angles and are congruent (equal) Flash Name another linear pair. Name another linear pair. Name another linear pair. Name another pair of vertical angles. A linear pair has a total measure of __________ Vertical Angles are __________