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Unit 3 Vocabulary

Name: ___________________________________
Period: _______________ Date: ______________
Due by the end of the 2nd 6 Weeks, 11/9/18
Across
When two lines intersect, the angles that are opposite each other are ________ angles. (p. 155)
Recall that the _____________ Theorem states that for a right triangle with legs of length a and b and hypotenuse of length c, a^2 + b^2 = c^2. (p. 187)
Alternate Interior Angles _______: If two parallel lines are cut by a transversal, then the pairs of alternate interior angles have the same measure. (p. 164)
By using geometric relationships along with a compass and a straightedge, you can _________ geometric figures with greater precision than figures drawn with standard measurement tools. (p. 185)
______________ Bisector Theorem: If a point is on the _____________ bisector of a segment, then it is equidistant from the endpoints of the segment. (p. 186)
When two lines intersect, the angles that are on the same side of a line form a(n) ______ pair. (p. 155)
_____________ angles are two angles whose measures have a sum of 180°. (p. 158)
_____________ angles are two angles whose measures have a sum of 90°. (p. 158)
In a(n) ________ proof, you assume that the statement you are trying to prove is false. Then you use logic to lead to a contradiction of given information, a definition, a postulate, or a previously proven theorem. (p. 187)
____-side interior angles lie on the ____ side of the transversal and between the intersected lines. (p. 163)
If two angles are vertical angles, then the angles are __________. (p. 156)
Alternate ________ angles lie on opposite sides of the transversal and outside the intersected lines. (p. 163)
Same-Side Interior Angles _________: If two parallel lines are cut but a transversal, then the pairs of same-side interior angles are supplementary. (p. 164)
_________ interior angles are nonadjacent angles that lie on opposite sides of the transversal between the intersected lines. (p. 163)
Down
The _________ of the postulate and theorems you have learned about lines cut by a transversal are also true. (p. 173)
To ______ something to be true, you use definitions, properties, postulates and theorems that you already know. (p. 164)
The Parallel Postulate: Through a point P not on line l, there is ________ one line parallel to l. (p. 176)
______________ angles lie on the same side of the transversal and on the same sides of the intersected lines. (o. 163)
You can use a flow ______ to prove the Vertical Angles Theorem. (p. 156)
Two angles that form a linear ____ are supplementary. (p. 158)
A(n) ____________ is a line that intersects two coplanar lines at two different points. (p. 163)
A linear pair is a pair of ________ angles whose non-common sides are opposite rays. (p. 155)
Parallel lines lie in the same plane and never _________. (p. 163)
Corresponding Angles Theorem: If two parallel lines are ___ by a transversal, then the pairs of corresponding angles have the same measure. (p. 165)