1.5 Angle Relationships

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1.5 Angle Relationships
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Pairs of Angles

• Adjacent lts (adj lts) - lts in same plane with
  common vertex side but no common int pts
• Vertical lts (vert lts) 2 non-adj lts formed by 2
  intersecting lines
• Linear Pair (linear pr) adj lts whose noncommon
  sides are opp rays

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Angle Relationships

• Complementary lts (comp) 2 lts w/ sum of 90
• Supplementary lts (supp) 2 lts w/ sum of 180

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Examples

• 20 comp ____ 2. 93 comp ____
• 3. 20 supp ____ 4. 93 supp ____

Find meass of 2 supp lts if one lt is 6 less than
5 times the other lt
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Perpendicular Lines ( ) lines that form rt lts
X
W
Y
Z
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Example What can/cannot be assumed from the
picture?
mltVYT 90 ltTYW ltTYU are supp ltVYW
ltTYS are adj lts
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Examples

• Find meass of ltABG, ltDBC, ltEBF
• Name an lt adj to ltEBD
• Name an lt vert to ltDBA
• Name the comp of ltFBG
• Name the supp of ltABC
• Which lt forms a linear pr with ltEBF?
• Which pr of lines are perpendicular?
• T or F ltDBC ltEBF are vert lts.

D
C
90
38
E
A
B
30
F
G
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Assignment

• 1.5 p. 42 (12-22 even, 23-29 all, 31-35 all,
  38-62 even)