VIII - Geometry
Standard 8.G.1.1 - Use the fact that the angle sum of triangles is 180º and quadrilaterals is 360º to find the missing interior angle.
Included Skills: Geometry
Understanding shapes: • Properties of quadrilaterals †Sum of angles of a quadrilateral is equal to 360° (By verification) • Properties of parallelogram (By verification) - Opposite sides of a parallelogram are equal, - Opposite angles of a parallelogram are equal, - Diagonals of a parallelogram bisect each other. [Why (iv), (v) and (vi) follow from (ii)] - Diagonals of a rectangle are equal and bisect each other. - Diagonals of a rhombus bisect each other at right angles. - Diagonals of a square are equal and bisect each other at right angles.