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Geometry Vocabulary
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Terms in this set (23)
Linear Pair
A pair of angles that share a side and a vertex
Supplementary Angles
Two angles that add to 180
Complementary Angles
Two angles that add to 90
Vertical Angles
A pair of opposite congruent angles formed by intersecting lines
Alternate Interior Angles
angles between 2 lines and on opposite sides of a transversal
Alternate Exterior Angles
Angles that lie outside a pair of lines and on opposite sides of a transversal.
Same-Side Interior Angles
two interior angles on the same side of the transversal
Corresponding Angles
Angles in the same place on different lines
Angle Addition Postulate
If P is in the interior of <RST, then m<RSP + m<PST = m<RST (Little + Little = Big)
Angle Bisector
a ray that divides an angle into two congruent angles (Little = Little)
Midpoint
A point that divides a segment into two congruent segments
Midpoint Theorem
If M is the midpoint of AB, then AM is congruent to MB
Segment Addition Postulate
If B is between A and C, then AB + BC = AC
Acute Triangle
A triangle with 3 acute angles
Right Triangle
a triangle with one right angle
Obtuse Triangle
a triangle with one obtuse angle
Equilateral Triangle
A triangle with three congruent sides
Isosceles Triangle
a triangle with at least two congruent sides
Scalene Triangle
a triangle with no congruent sides
Triangle Sum Theorem
The sum of the measures of the interior angles of a triangle is 180 degrees
Definition of Congruent Segments
segments that have the same length
if congruent then they are equal
Definition of Congruent Angles
Two angles are congruent if and only if they are equal
Converse of Corresponding Angles Postulate
If corresponding angles are congruent, then the two lines are parallel
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