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50 Cards in this Set
- Front
- Back
point
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indicates position on a line, or in a plane
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Line
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Set of points which extends infinitely in 2 directions
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Space
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Set of all points
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Collinear Points
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Are points all in one line
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Non Collinear Points
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3 points not in one line
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Coplanar points
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Points all on one plane, you might not see the plane on which the points are on
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Non Coplanar Points
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Points that are not all on one plane
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Segment
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Part of a line, which consists of two end points and all points in between
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Ray
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Part of a line, which has one end point and extends infinitely in one direction
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Opposite Rays
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Collinear rays which share the same end point
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Postulate
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Statement accepted without proof
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Congruent Segments
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Are segments that have equal lengths
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Midpoint of a segment
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that divides the segment into two congruent segments
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Bisector of a segment
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A line, segment, ray, or plane that intersects the segment at its midpoint
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Angle
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Figure formed by two rays which have the same end point
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Acute angle
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Measures between 0 and 90
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Right Angle
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Measures 90
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Obtuse Angle
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Measures between 90 and 180
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Straight Angle
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Measures 180
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Congruent Angles
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Angles that have equal measures
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Bisector of an angle
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Ray that divides the angle into two congruent adjacent angles
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Complementary angles
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Two angles who measures have the sum 90
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Supplementary Angles
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Two angles whose measures have the sum 180
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Vertical Angles
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Non adjacent angles formed by intersecting lines
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Perpendicular lines
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Two lines that intersect to form right angles
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Parallel lines
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Coplanar lines that do not intersect
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Transversal
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Line that intersects two or more coplanar lines in different points
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Triangle
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Figure formed by three segments joining 3 non-collinear points
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Scalene triangle
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No sides are congruent
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Isosceles
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At least two sides are congruent
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Equilateral
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All sides are congruent
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Acute
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3 acute angles
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Obtuse
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1 obtuse angle
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Right
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1 right angle
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Equiangular
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All angles are congruent
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Regular Polygon
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Polygon that is both equiangular and equilateral
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Congruent triangles
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Corresponding angles are congruent/corresponding sides are congruent
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Legs of an isosceles Triangle
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The congruent sides
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Base
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Side not congruent to either of the other sides
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Base Angles
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Angles, which include the base
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Vertex Angle
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Angle opposite the base
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Legs of an Isosceles Triangle
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The congruent sides
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Legs of a right triangle
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Sides, which make up the right angle
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Hypotenuse
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Side opposite the right angle
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Median of a triangle
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Segment from a vertex to the midpoint of the opposite side
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Altitude of a triangle
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the perpendicular segment from a vertex to the line that contains the opposite side
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Perpendicular bisector of a segment
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A line or ray or segment that is perpendicular to the segment at its midpoint
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SSS Postulate
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If 3 sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent
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SAS Postulate
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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
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ASA Postulate
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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
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