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.
Parallelogram with two pairs of adjacent sides congruent and without opposite sides congruent.
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.
Any parallelogram that has 4 right angles.
Any parallelogram with 4 congruent sides.
Parallelogram with four congruent sides and four congruent angles.
Quadrilateral with exactly one pair of parallel sides.
Interactive Geometric Applets: Relevant Theorems.
A parallelogram, a square, a rhombus, and a rectangle share the same properties. Opposite sides
are parallel and congruent, opposite angles are congruent, consecutive angles are supplementary, and
diagonals bisect each other. This applet may be manipulated to get each one of these figures.
Move it around to make it comply for each one of them.
The Isosceles Trapezoid is the rebel of the quadrilaterals. It only has one pair of parallel sides,
and one pair of congruent sides. Opposite angles are supplementary, and base angles are
congruent. All these reasons sets it apart from the parallelograms. Play with this interactive
to verify these properties. Meet the rebel!
Vocabulary Puzzle Interactive
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