Slicing a Parallelogram

Explore the relationships of line segments when the area of a parallelogram is halved.

Area Formulas

Explore the similarity of the area formulas for quadrilaterals and triangles.

Table Arrangement

Explore seating arrangements using square tables.

Interior Angles

Explore the sum of interior angles of a quadrilateral.

Integral Sides

Explore area and perimeter of quadrilaterals whose sides have integral length.

Overlapping Squares

Make more squares from less.

Perplexing Pentominoes

Explore with pentominoes.

Leaving Squares

Remove toothpicks from the figure to leave five squares.

Shaded Squares

Determine the number of “outside” squares in a given figure.


Explore various relationships in a given construction involving a parallelogram.