Lesson 1-5

• I can identify and use special pairs of angles

• I can identify perpendicular lines

2 angles with a sum of 90°

2 angles with a sum of 180°

40°

50°

2 angles that share a vertex and side

2 adjacent angles that make a line

2 non-adjacent angles formed by intersecting lines

12

34

adjacent

adjacent, linear pair

vertical

adjacent

adjacent

supplementary, adjacent and linear pair

complementary

lines that intersect to form right angles

A

B

X

Y┴AB XY

9x + 5 + 3x + 1 = 90

12x + 6 = 9012x = 84

x = 7

3x + 10 x

25

x + 3x + 10 = 90

4x + 10 = 904x = 80 x = 20

20

70

2070

65

65

x

2x + 21x + 2x + 21 = 90

3x + 21 = 903x = 69 x = 23

23

67

23° and 67°

ASSIGNMENT:Lesson 1-5 worksheetSkip #8, 9, 10, and 13

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