Given quadrilateral ABCD with diagonals AC¯¯¯¯¯ and BD¯¯¯¯¯ that intersect at point E, write three properties that guarantee ABCD is a parallelogram. Use symbols.

1._________________________ 2. _________________________ 3. _________________________


Draw a Euler diagram that includes the following: parallelogram, square, rectangle, rhombus, quadrilateral, trapezoid.