Acute angle- An angle less then 90 degrees but more then 0 degrees.
Obtuse angle- an angle between 90 and 180 degrees.
Straight angle- an angle of 180 degrees.
Right angle-an angle of 90 degrees, like the corner of a square.
Quadrilateral-having 4 sides.
Square-a rectangle with all 4 sides the equel length.
Rectangle- a parallelogram having 4 right angles.
Rhombus- a romboheadron or a shape with 4 equal sides.
Trapezoid- having 2 parallel lines and 2 non parallel lines.
Parallelogram- having both sides parallel to each other.
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