Name ____________________________
Per_____ Date __________
Geometry S
Review for Quiz:
Isosceles, Right and Isosceles Right Triangle Proofs
Perform the following proofs on the graph paper provided. Remember to show all your work. Follow the
“Goof-Proof Guidelines”
1.) The vertices of Δ ABC are A (-1, -2), B (1, 2) and C (3, -2). Prove by means
of coordinate geometry that ABC is an isosceles triangle.
2.) The vertices of Δ DEF are D (-1, 4), E (3, 1) and F (6, 5). Prove by means of
coordinate geometry that DEF is a right triangle.
3.) The vertices of Δ XYZ are X (-2, -2), Y (-1, 3) and Z (4, 2). Prove by means
of coordinate geometry that XYZ is an isosceles right triangle.