| A | B |
|---|
| Acute Angles | measures less than 90 degrees |
| Obtuse Angles | measures greater than than 90, less than 180 degrees |
| Right Angles | measures 90 degrees |
| Straight Angle | measures 180 degrees |
| Congruent | equal |
| Interior Angles | Angles inside a shape |
| Parallel lines | lines never intersect |
| intersect | to cross or touch each other |
| perpendicular lines | lines that intersect and form 90 degree angles |
| Circle | circumference |
| parallelogram | opposites sides are parallel and congruent |
| rectangle | opposite sides are parallel, all angles are 90 degrees |
| Rhombus | opposite sides are parallel and all sides are congruent |
| Square | all sides are equal, all angles are 90 degrees |
| Trapezoid | exactly one pair of parallel sides |
| Triangle | interior angles = 180 degrees |
| perimeter | the outer border of something |
| area | space inside of something |
| formula for perimeter of parallelogram | P = S + S + S + S |
| formula for area | Area = Base X Height |
| Perimeter of Triangle | P = S + S + S |
| Perimeter for Square | P = S + S + S + S |
| Area of parallelogram | Area = base X Height |
| Area of Rectangle | Area = length X Width |
| Perimeter of Rectangle = | P = 2(L + W) |
