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Triangles

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Triangles

Classified by their SIDES and by their ANGLES.

- Equilateral: All sides are congruent
- Isosceles: At least 2 sides are congruent
- Scalene: None of the sides are congruent

- Acute: all 3 angles are acute angles
- Obtuse: 1 obtuse angle (leaving 2 acute angles)
- Right: 1 right angle (leaving 2 acute angles)

Quadrilaterals

4-sided figures

- Opposite sides are congruent
- Opposite sides are parallel

- Opposite sides are congruent
- Opposite sides are parallel
- 4 right angles

- Opposite sides are congruent
- Opposite sides are parallel
- 4 right angles
- 4 congruent sides

- Opposite sides are congruent
- Opposite sides are parallel
- 4 congruent sides

- One pair of parallel sides