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29 Cards in this Set
- Front
- Back
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Acute angle
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Less than 90 degrees
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Altitude
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a line segment extending from the vertex of a triangle to a part of the opposite side where the segment and the side intersect at a right angle.
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Angle Bisector
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a triangle is a segment drawn from a vertex that bisects (cuts in half) that vertex angle.
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Circumcenter
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intersection of the sides' perpendicular bisectors
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Circumscribed
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A geometric figure that is drawn around another geometric figure so as to touch all its vertices is called Circumscribed.
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Collinear
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lying on the same straight line
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Complementary angles
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if they add up to 90 degrees (a Right Angle).
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Coplanar
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Lying in the same plane
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Endpoints
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A place where something ends or is complete
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Incenter
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The center of the incircle is called the triangle's incenter.
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Inscribed
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To draw (one figure) within another figure so that every vertex of the enclosed figure touches the outer figure.
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Linear Pair
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formed when two lines intersect.
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Midpoint
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the middle point of a line segment. It is equidistant from both endpoints.
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Plane
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all about shapes like lines, circles and triangles ... shapes that can be drawn on a flat surface
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Postulate
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statements that are assumed to be true without proof.
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Pre-Image
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original position of a figure in a plane
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Adjacent angle
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adjacent angles are angles that have a common ray coming out of the vertex going between two other rays.
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Vertical Angles
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pair of angles is said to be vertical (also opposite and vertically opposite) if the angles are formed from two intersecting lines and the angles are not adjacent.
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Inductive Reasoning
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reasoning from detailed facts to general principles
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Deductive reasoning
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reasoning from the general to the particular
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Rigid Transformation
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the pre-image and the image both has the exact same size and shape.
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Segment Bisector
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Any line, segment or ray that intersects a segment at its midpoint.
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Perpendicular Bisector
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A line, or line segment, that intersects a given line segment at its midpoint and forms right angles.
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Counterexample
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An example that refutes or disproves a hypothesis
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Conditional
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P>Q and ~N>P then you can conclude: if ~N>Q
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Converse
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the "if" and "then" parts of a sentence are switched.
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Inverse
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reversed (turned backward) in order or nature or effect
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Contrapositive
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the inverse of the converse of a given proposition
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Indirect reasoning
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Reasoning (proofs) using the Law of the Contrapositive
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