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# MATH

### GEOMERTY ANGLES

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 do not overlap.
Base One of the two parallel congruent faces of a prism.
Complementary angles Two angles are Complementary if the sum of their measures are 90'.
Cone A three dimensional figure with one circular base connected by a curved surface to a single vertex.
Congruent Having the same measure.
Congruent segments Sides with the same length.
Coplanar Lines or points that lie in the same plane.
Cross Section The cross section of a solid and a plane.
Cylinder A three dimensional figure with two parallel congruent circular bases connected by a curved surface.
Diagonal A line segment that connects two nonconsecutive vertices.
Edge The line segment when two faces of a polyhedron intersect.
Equilateral Triangle A triangle having three congruent sides.
Face A flat surface of a polyhedron.
Isoceles Triangle A triangle having at least two congruent sides.
Obtuse angle Any angle that measures greater than 90' but less than 180'.
Obtuse Triangle A triangle having one obtuse angle.
Plane A two dimensional flat surface that extends in all directions.
Polyhedron A three dimensional figure with faces that are polygons.
Prism A polyhedron with two parallel congruent faces called bases.
Pyramid 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.
Scale model A model used to represent objects that are to large or too small to be built at actual size.
Scalene triangle A triangle having no congruent sides.
Straight Angle An angle that measures exactly 180'.
Supplementary angles Two angles are supplementary if the sum of their measures is 180'.
Triangle A figure with three sides and three angles.
Vertex The point at the tip of the cone.
Vertical angles opposite angles formed by the intersection of two lines. Verticle angles are congruent.
Created by: shelbyartley