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50 Cards in this Set
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 Back
point

indicates position on a line, or in a plane


Line

Set of points which extends infinitely in 2 directions


Space

Set of all points


Collinear Points

Are points all in one line


Non Collinear Points

3 points not in one line


Coplanar points

Points all on one plane, you might not see the plane on which the points are on


Non Coplanar Points

Points that are not all on one plane


Segment

Part of a line, which consists of two end points and all points in between


Ray

Part of a line, which has one end point and extends infinitely in one direction


Opposite Rays

Collinear rays which share the same end point


Postulate

Statement accepted without proof


Congruent Segments

Are segments that have equal lengths


Midpoint of a segment

that divides the segment into two congruent segments


Bisector of a segment

A line, segment, ray, or plane that intersects the segment at its midpoint


Angle

Figure formed by two rays which have the same end point


Acute angle

Measures between 0 and 90


Right Angle

Measures 90


Obtuse Angle

Measures between 90 and 180


Straight Angle

Measures 180


Congruent Angles

Angles that have equal measures


Bisector of an angle

Ray that divides the angle into two congruent adjacent angles


Complementary angles

Two angles who measures have the sum 90


Supplementary Angles

Two angles whose measures have the sum 180


Vertical Angles

Non adjacent angles formed by intersecting lines


Perpendicular lines

Two lines that intersect to form right angles


Parallel lines

Coplanar lines that do not intersect


Transversal

Line that intersects two or more coplanar lines in different points


Triangle

Figure formed by three segments joining 3 noncollinear points


Scalene triangle

No sides are congruent


Isosceles

At least two sides are congruent


Equilateral

All sides are congruent


Acute

3 acute angles


Obtuse

1 obtuse angle


Right

1 right angle


Equiangular

All angles are congruent


Regular Polygon

Polygon that is both equiangular and equilateral


Congruent triangles

Corresponding angles are congruent/corresponding sides are congruent


Legs of an isosceles Triangle

The congruent sides


Base

Side not congruent to either of the other sides


Base Angles

Angles, which include the base


Vertex Angle

Angle opposite the base


Legs of an Isosceles Triangle

The congruent sides


Legs of a right triangle

Sides, which make up the right angle


Hypotenuse

Side opposite the right angle


Median of a triangle

Segment from a vertex to the midpoint of the opposite side


Altitude of a triangle

the perpendicular segment from a vertex to the line that contains the opposite side


Perpendicular bisector of a segment

A line or ray or segment that is perpendicular to the segment at its midpoint


SSS Postulate

If 3 sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent


SAS Postulate

If 2 sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent


ASA Postulate

Of 2 angles and the included side of one triangle are congruent to 2 angles and the included side of another triangle, and then the triangles are congruent
