## Helpful Links

## Theorems

**Rectangles:**

**Definition:** Equiangular quadrilateral (All angles equal 90 degrees)

**Theorem 6:** Diagonals are equal.

**Rhombus:**

**Definitions:** Equilateral quadrilateral (All sides are equal)

**Theorem 6:** Diagonals are perpendicular.

**Theorem 7:** Diagonals bisects opposite angles.

**Square:**

**Definition:** Regular Quadriateral. (All sides and angles are equal)

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