Geometric 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.
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 quadrilateral whose angles are all right angles.
Line segment; A section of a line, defined by two end points and all the points between them.
Interactive Geometric Applets: Relevant Theorems.
In a parallelogram you have properties that allow you to solve for angles, and sides
in the parallelogram. Some of these are opposite sides parallel and congruent, opposite
angles congruent, consecutive angles supplementary, and diagonals bisect each other.
Follow the directions in this interactive geometric applet to check all of them.
A rectangle is a special parallelogram that has all angles right and congruent. It has
congruent diagonals, that bisect forming four congruent segments. Opposite sides
are parallel and congruent. Interact with this great geometric applet to generate
multiple instances of rectangles and appreciate how it complies with all these properties.
Vocabulary Puzzle Interactive
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