Triangles
The sum of the 3 angles in a triangle
180
Pair of Complementary Angles
Any Acute (2, 3, 6, 7) and any Obtuse (1, 4, 5, 8)
Two angles that add up to 90 degrees are called __________.
Complementary Angles
Two lines, in the same plane, that never intersect.
Parallel Lines
Number of obtuse angles in an obtuse triangle
1
What is a transversal?
A line that intersects two or more lines
Two congruent angles that are across from each other are called ________?
Vertical
A triangle with 3 equal sides
Equilateral
Angle 1 = 30
Angle 2 = 60
Angle 3 = ?
What type of triangle is this?
90, Right Triangle
If Angle 8 is 120, find Angle 6
60
Two angles that add up to 180 degrees
Supplementary
Two angles are supplementary. One angles measures 105 degrees. What is the measure of the other angle?
75
Angle 1 = 28
Angle 2 = 134
Angle 3 = ?
What type of triangle is this? (2 answers)
18, Obtuse and Scalene
If Angle 7 = 2x, find Angle 2
2x
An angle that measures 180 degrees
Straight
What does it mean to be congruent?
Same/Equal
What is the measure of one angle in an Equilateral Triangle?
60
Name all angles congruent to Angle 1
4, 5, 8
An angle that measures 90 degrees
Right
Draw the symbol for congruence
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