1. The problem is to find unknown angles in various polygons: triangle, square, rhombus, kite, and quadrilateral. 2. Important formulas and rules: - Triangle: Sum of interior angles is $180^\circ$. - Square: All angles are $90^\circ$. - Rhombus: Opposite angles are equal, adjacent angles are supplementary (sum to $180^\circ$). - Kite: Two pairs of adjacent equal sides, one pair of opposite angles equal. - Quadrilateral: Sum of interior angles is $360^\circ$. 3. Example for a triangle: If two angles are known, the third angle is $180^\circ$ minus the sum of the known angles. 4. Example for a rhombus: If one angle is known, the opposite angle is the same, and adjacent angles are $180^\circ$ minus the known angle. 5. For a kite, if one angle between unequal sides is known, the opposite angle is equal. 6. For a quadrilateral, sum all known angles and subtract from $360^\circ$ to find the unknown angle. 7. For a square, all angles are $90^\circ$, so unknown angles are $90^\circ$. This worksheet helps practice finding unknown angles using these rules and formulas.