4. Possible categories: * polygons * 3 angles * 3 sides * Equilateral triangles: all sides are congruent * Scalene triangles: all sides are different * Isosceles triangle: two sides are congruent * Right triangles: have one 90 degree angle * Acute triangles: have all angles less than 90 degree angles * Obtuse triangles: have one angle greater than 90 degrees

8. Categories of Quadrilaterals: * 4 sides/quadrilaterals *4 angles/vertices * polygon *rectangles *squares *rhombus/diamond *trapezoid *parallel sides *perpendicular sides (right angles) *types of angles (acute, right, obtuse) *congruent sides *irregular quadrilaterals *2 dimensional