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Students use their knowledge of the sum of the interior angles of polygons to work out unknown angles for a variety of 2-dimensional shapes.

Students use their knowledge of the interior angles of regular polygons, isosceles triangles, and parallelograms to work out unknown angles for a variety of 2-dimensional shapes.

Students use the angle-in-a-semicircle property, and the sum of the angles in a triangle to find unknown angles.

Using a diagram of a regular hexagon, students calculate its interior and exterior angles.

Students calculate the interior and exterior angles of a regular octagon and explain their calculations.