## Midterm Part 1

##### Created by:

jkahl  on January 11, 2011

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# Midterm Part 1

 Acute Anglean angle whose measure is between 0 and 90
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#### Definitions

Acute Angle an angle whose measure is between 0 and 90
Adjacent Angles 2 coplaner angles that have a common side, common vertex, but no common interior points
Alternate Interior Angles non adjacent interior angles that lie on opposite sides of the transversal and are congruent if the lines are parallel
An ? is formed by 2 rays with the same endpoint. angle
Angle Bisector a ray that divides an angle into 2 congruent angles
Axes the horizontal and vertical number lines of a coordinate plane that intersects at right angles
Axiom an accepted statement or fact
Biconditional the combination of a conditional statement and its converse
Collinear Points points that lie on the same line
Compass a geometric tool used to draw circles
Complementary Angles 2 angles that have the sum of 90
Conclusion the part of an if-then statement that follows "then"
Conditional an "if-then" statement
Congruent Angles angles that have the same measure
Congruent Segments segments that have the same length
Conjecture a conclusion or guess reached by using inductive reasoning
Construction a geometric figure made with only a straight edge or compass
The ? of the conditional "if p then q" is "if q then p". converse
The ? is its distance and direction from the origin of a number line. coordinates of a point
Coordinate Plane formed by 2 number lines intersecting at right angles
Coplanar Figures figures in the same plane
Corresponding Angles angles that are in corresponding postions relative to 2 parallel lines cut by a transversal
Counter Example a particular example or instance of a statement makes the statement false
Deductive Reasoning a process of reasoning logically from given facts to a conclusion
Endpoint the starting and ending point of a line segment
Hypothesis the part that follows the "if" in an if-then statement
Inductive Reasoning a type of reasoning that reaches conclusions based on a pattern of specific examples or past events
Line a series of points that extend in 2 directions without end
Measure of an Angle a number of degrees greater than 0 and less than or equal to 180 using a protractor
Midpoint of a Segment the point that divides a segment into 2 congruent segments
Obtuse Angle an angle whose measure is between 90 and 180
Opposite Rays collinear rays with the same endpoint
Origin the point (0,0) where the 2 number lines meet and intersect
Parallel Lines llines that lie in the same plane and do not intersect
Parallel Planes planes that do not intersect
Perimeter of a Polygon the sum of the length of the sides of a polygon
The ? of a segment of a segment is a line, segment, or ray that is perpendicular to the segment at its midpoint. perpendicular bisector
Perpendicular Lines lines that intersect to form right angles
Plane a flat surface that has no thickness
Point a location that has no size
Postulate an accepted statement or fact
Quadrant the 4 regions of a coordinate plane that are divided by the axes
Ray the part of a line consisting of one endpoint and all the points of the line on one side of the endpoint
Right Angle an angle whose measure is 90
Same Side Interior Angles angles that lie on the same side of the transversal and are supplementary if the lines are parallel
Segment part of a line consisting of 2 endpoints and all points in between them
Segment Bisector a line, segment, ray or plane that intersects a segment at its midpoint
One of the 2 rays forms a ? of an angle. side
Skew Lines lines that do not lie in the same plane and do not intersect
Space the set of all points
Straight Angle an angle whose measure is 180
Straightedge a ruler with no markings on it
2 angles are ? if the sum of their measures is 180 supplementary angles
Transversal a line that intersects 2 coplanar lines in 2 points
The ? of a statement is true or false according to whether the statement is true or false. truth value
Vertex the common endpoint of the sides of an angle
Vertical Angles two angles whose sides form 2 pairs of opposite rays

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