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50 Cards in this Set

  • Front
  • 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 non-collinear 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