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Published byAshley Montgomery Modified over 6 years ago
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An angle that measures between 0 and 90 degrees.
Acute Angle
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To cut in half. Bisect
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The point where the angle bisectors of a triangle meet.
Incenter
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A polygon that is both equilateral and equiangular.
Regular Polygon
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Objects that lie in the same plane.
Coplanar
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Two angles whose measures add up to ninety degrees.
Complementary Angles
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Two adjacent angles whose noncommon sides form opposite rays.
Linear Pair
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A segment that connects the midpoints of two sides of a triangle.
Midsegment
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A segment that connects a vertex of a triangle with the midpoint of the opposite side.
Median
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A triangle with three congruent sides.
Equilateral/ Equiangular/Acute/ Regular/Isosceles
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The distance around a figure.
Perimeter
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A polygon with four congruent sides.
Equilateral Quadrilateral
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Objects that have the same angle measures and the same side lengths.
Congruent Figures
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Every point on the ______ is equidistant from the endpoints of the segment.
Perpendicular Bisector
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The side of a right triangle opposite the right angle.
Hypotenuse
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A point that divides a segment into two congruent segments.
Midpoint
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c2 = a2 + b2. The Pythagorean Theorem
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Two angles whose measures add up to one hundred and eighty degrees.
Supplementary Angles
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The angles adjacent to the base.
Base Angles
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The angle in an isosceles triangle opposite the base.
Vertex Angle
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Lines that intersect to form a right angle.
Perpendicular Lines
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Points that lie on the same line.
Collinear Points
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A non-rigid transformation.
Dilation
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An educated guess based on observations.
Conjecture
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The ratio of rise over run between two points on a coordinate plane.
Slope
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The point of concurrency of the medians of a triangle.
Centroid
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What you need to prove a conjecture is false.
Counterexample
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A statement that is accepted without proof.
Postulate
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A polygon that has no “dents”.
Convex Polygon
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The point of concurrency of the altitudes in a triangle.
Orthocenter
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The point of intersection of the perpendicular bisectors of a triangle.
Circumcenter
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A polygon that has a dent.
Concave
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A series of statements and reasons that explain why something is true.
Proof
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A triangle with at least two congruent sides.
Isosceles Triangle
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The words that follow “then” in a conditional statement.
Conclusion
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A line that intersects two other lines at different points.
Transversal
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A segment or line that goes from a vertex of a triangle to the opposite side or to a line that contains the opposite side and makes a right angle. Altitude
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Lines that do not intersect and are not coplanar.
Skew Lines
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The words that follow “if” in a conditional statement.
Hypothesis
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The two sides of a right triangle that form the right angle.
Legs of a right triangle
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A statement that contains the phrase “if and only if.”
Biconditional statement
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Coplanar lines that do not intersect.
Parallel Lines
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