Problem:

Plot the following points, and connect them in the order given: A (2,1) B (2,5) C (6,1) and A (2,1).

What shape do you get?

Explain how you know.

Answer:

Answers may vary, however, all explanations should mention that the triangle has a right angle and two equal sides.

Example:         AB and AC are equal sides because each is four units long. Angle A is a right angle, which makes triangle ABC an isosceles right triangle.