Altitude of a triangle (height)
The perpendicular segment from a vertex to the line containing the opposite side of a triangle.
Altitude of a trapezoid (height)
The distance between the bases of a trapezoid.
Geometry shape formed by two rays (initial and ending sides of the angle) that share a common endpoint called the vertex. You may name an angle using the vertex, or a point in each ray and the vertex label in the center.
The amount of space taken up in a plane by a figure.
The side of an isosceles triangle whose endpoints are the vertices of the base angles.
The angle opposite one of the equilateral sides in an isosceles triangle.
Base of a trapezoid
The parallel sides of a trapezoid.
A triangle whose sides are equal in length.
A triangle with two sides of equal length.
Trapezoid with two non-congruent and non-parallel sides.
An angle whose measure is greater than 90 but less than 180 degrees.
A triangle with one acute angle.
Any quadrilateral with two pairs of opposite sides parallel.
It is a closed plane figure with a least three straight segments as sides.
A four-sided polygon.
A triangle that has a 90 degree angle.
Any parallelogram with 4 congruent sides.
A triangle with no equilateral sides.
An equilateral and equiangular quadrilateral.
A polygon with three sides.
Quadrilateral with exactly one pair of parallel sides.
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