Common Core · High school
HSG-CO.C.11
High school — Prove theorems about parallelograms: opposite sides are congruent, opposite angles are congruent, the diagonals bisect each other, and rectangles are parallelograms with congruent diagonals.
The skill that covers it
What a student should be able to do
- Find the interior and exterior angle sums of a polygon and each angle of a regular one.
- Use the side, angle and diagonal properties of a parallelogram to find unknowns.
- Apply the special properties of rectangles, rhombi, squares, trapezoids and kites.
- Classify a quadrilateral from a list of its properties, choosing the most specific name.