# Triangles - PowerPoint PPT Presentation

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Triangles. Classified by their SIDES and by their ANGLES. Triangles Classified by their SIDES. Equilateral : All sides are congruent Isosceles : At least 2 sides are congruent Scalene : None of the sides are congruent. Triangles Classified by their ANGLES.

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Triangles

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## Triangles

Classified by their SIDES and by their ANGLES.

### TrianglesClassified by their SIDES

• Equilateral: All sides are congruent

• Isosceles: At least 2 sides are congruent

• Scalene: None of the sides are congruent

### TrianglesClassified by their ANGLES

• Acute: all 3 angles are acute angles

• Obtuse: 1 obtuse angle (leaving 2 acute angles)

• Right: 1 right angle (leaving 2 acute angles)

4-sided figures

### Parallelogram

• Opposite sides are congruent

• Opposite sides are parallel

### Rectangle

• Opposite sides are congruent

• Opposite sides are parallel

• 4 right angles

### Square

• Opposite sides are congruent

• Opposite sides are parallel

• 4 right angles

• 4 congruent sides

### Rhombus

• Opposite sides are congruent

• Opposite sides are parallel

• 4 congruent sides

### Trapezoid

• One pair of parallel sides