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50 Cards in this Set
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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
