4-X.1 Acute, obtuse, and right triangles

4-X.4 Parallel sides in quadrilaterals

4-X.9 Classify quadrilaterals

4-Y.1 Identify lines of symmetry

4-Y.2 Draw lines of symmetry

4-Y.3 Count lines of symmetry

4-Z.1 Acute, right, obtuse, and straight angles

Brainpop: Angles

Khan Academy: Naming Angles

Brainpop Game: Sort Angles

Khan Academy: Classifying Quadrilaterals

Khan Academy: Symmetry