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# Math Vocabulary List

TermDefinition
Acute Angle An angle with a measure greater than 0 and less than 90.
Acute Triangle A triangle having three acute angles.
Adjacent Angles Angles that have the same vertex,share a common side and don't overlap.
Base In a power, the number used as a factor.
Complementary Angles Two angles are complementary if the sum of their measure is 90.
Congruent Having the same measure.
Cross Section The cross section of a solid and a plane.
Edge The line segment where two faces of a polyhedron intersect.
Equilateral Triangle A triangle having three congruent sides.
Face A flat surface of a polyhedron.
Isosceles Triangle A triangle having at least two congruent sides.
Obtuse Angle Any angle that measures greater than 90 less than 180.
Obtuse Triangle A triangle having one obtuse angle.
Polyhedron A three-dimensional figure with faces that are polygons.
Prism A polyhedron with two parallel congruent faces called bases.
Pyrimid A polyhedron with one base that is a polygon and three or more triangular faces that meet at a common vertex.
Right Angle An angle that measures exactly 90.
Right Triangle A triangle having one right angle.
Scalene Triangle A triangle having no congruent sides.
Straight Angle An angle that measures exactly 180.
Supplementary Angles Two angles are supplementary if their sum measures 180.
Triangle A figure with three sides and three angles.
Vertex A vertex of an angle is the common endpoint of the rays forming the angle.
Vertical angles Opposite angles formed by the intersection of two lines.