GR.12 Foundation Geometry & Reasoning

Angles & Polygons 1c (triangles and quadrilaterals)

3 lessons · 6 variations each

1
GR.12.1

Interior angles of triangles and quadrilaterals

Derive the sum of interior angles in triangles and quadrilaterals

 2
GR.12.2

Exterior angles of a triangle

Derive and use the fact that the exterior angle of a triangle is equal to the sum of the two opposite interior angles (H)

 3
GR.12.3

Problem solving - angles in triangles and quadrilaterals

Solve angle problems in triangles and quadrilaterals