Page 3 - Lesson Notes

 Square :
o A square is a quadrilateral where every angle is a right angle
(The little squares in each corner mean "right angle") and

o has equal sides (marked "s") and
o opposite sides are parallel.
 Rhombus :

o A rhombus is a quadrilateral where all sides have equal length
(marked "s") and
o opposite sides are parallel and
o opposite angles are equal.
o The diagonals (dashed lines) meet in the middle at a right
angle, i.e. they "bisect" (cut in half) each other at right angles.

o A rhombus is sometimes called a diamond.
 Parallelogram :

o A parallelogram is a quadrilateral which has opposite
sides parallel and equal in length and