Notes for Chapter 9 test Sheet #1

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Finding Measures

Vertical angles are the opposite angles formed by 2 intersecting lines and have the same measure

congruent angles have the same measure

supplementary angles are 2 angles whose measures add up to 180 degrees

complementary angles are 2 angles whose measure adds up to 90 degrees

Identifying Congruent Angles

* a line that intersects 2 other lines in different points is a transversal angle

corresponding angles lie on the same side of the transversal and in the same corresponding position relative to the lines intersected

Alternate interior angles lie on opposite sides of the transversal and in the region between the 2 intersected lines

* When 2 parallel lines are cut by the transversal, then corresponding angles and alternate interior angles are congruent

Naming Geometric Figures

* 2 lines intersect if they have exactly one point in common

Parallel lines are lines that lie in the same plane and do not intersect

Segments are parallel if they lie in parallel lines

Skew lines are lines that do not intersect and are not parallel and they do not lie in the same plane

Naming Lines, Segments and rays

lines are series of points continuously I opposite directions

segments are parts of line consisting of 2 end points and the points between them

rays are parts of a line consisting of one end point and all points on one side of the end point

Congruence

Congruent Figures have the same size and shape, so corresponding parts have equal measureThree Ways- SSS, SAS, ASA