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Acute Triangle
A triangle with three acute angles.
Obtuse Triangle
A triangle with one obtuse angle.
Right Triangle
A triangle that includes a right angle
Area
The amount of space that covers a two-dimensional figure, measured in square units.
Congruent
identical in form
Polygon
A two-dimensional shape that is closed and made of straight sides or edges.
Decagon
A ten-sided polygon.
Dodecagon
A twelve-sided polygon.
Heptagon
A seven-sided polygon.
Hexagon
A six-sided polygon.
Nonagon
A nine-sided polygon.
Octagon
An eight-sided polygon.
Pentagon
A five-sided polygon.
Quadrilateral
A four-sided polygon.
Rectangle
A quadrilateral with four congruent angles.
Parallelogram
A quadrilateral with two pairs of parallel sides.
Square
A quadrilateral with four congruent sides and angles.
Trapezoid
A quadrilateral with one pair of parallel sides.
Rhombus
A quadrilateral with four congruent sides.
Triangle
A three-sided polygon.
Vertex
A point where two or more edges of a polygon or polyhedron meet. Plural = vertices.
Volume
The amount of space a three-dimensional object takes up, measured in cubic units.
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