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.
Trapezoid with two non-congruent and non-parallel sides.
It is a closed plane figure with a least three straight segments as sides.
A four-sided polygon.
Line segment; A section of a line, defined by two end points and all the points between them.
Quadrilateral with exactly one pair of parallel sides.
Interactive Geometric Applets: Relevant Theorems.
In an Isosceles Trapezoid opposite angles are supplementary, it has only one pair of parallel sides,
and one pair of congruent sides. Diagonals are congruent, but they don't bisect each other.
This interactive geometric applet will allow you to visualize these properties in a dynamic
When working with isosceles trapezoids the parallel segments form
consecutive interior angles that are supplementary. You may review this property
for parallel lines cut by a transversal.
Drag point "B" in the below applet to verify this angle relationship.
Vocabulary Puzzle Interactive
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