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Classifying Polygons

Classifying Polygons. Lesson 9-3. Classifying Triangles. Triangles have 3 sides and can be classified or named based on 2 things—their angles and their sides. Triangles. By angles: Acute—all three angles are acute. Less than 90 degrees Right—has one right or 90 angle.

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Classifying Polygons

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  1. Classifying Polygons Lesson 9-3

  2. Classifying Triangles • Triangles have 3 sides and can be classified or named based on 2 things—their angles and their sides.

  3. Triangles • By angles: • Acute—all three angles are acute. • Less than 90 degrees • Right—has one right or 90 angle. • Obtuse—has one obtuse angle. • Greater than 90 degrees

  4. Triangles • By sides: • Equilateral—all three sides are equal. • Isosceles—two sides are equal. • Scalene—all three sides are different.

  5. Try This • Give two names for the following:

  6. Try This • Give two names for the following: Scalene, right

  7. Try This • Give two names for the following:

  8. Try This • Give two names for the following: Equilateral, acute

  9. Try This • Give two names for the following:

  10. Try This • Give two names for the following: Isosceles, acute

  11. Try This • Give two names for the following:

  12. Try This • Give two names for the following: Scalene, obtuse

  13. Quadrilaterals • Quadrilaterals have FOUR sides. These are examples of quadrilaterals:

  14. Classifying Quadrilateral • All four sided figures are quadrilaterals. They may or may not be symmetrical.

  15. Quadrilaterals • Parallelograms have 2 sets of parallel lines.

  16. Quadrilaterals • Parallelograms have 2 sets of parallel lines. • Rectangles have parallel lines and 90 angles.

  17. Quadrilaterals • Parallelograms have 2 sets of parallel lines. • Rectangles have parallel lines and 90 angles. • Rhombus has four equal sides.

  18. Quadrilaterals • Squares have four equal sides and four 90 angles.

  19. Quadrilaterals • Squares have four equal sides and four 90 angles. • Trapezoids have exactly one pair of parallel lines.

  20. Try This • Name all the names that apply for this shape:

  21. Try This • Name all the names that apply for this shape: • Quadrilateral, parallelogram, rectangle

  22. Try This • List all the names for this shape:

  23. Try This • List all the names for this shape: • Quadrilateral, parallelogram, rhombus

  24. Try This • List all the names for this shape:

  25. Try This • List all the names for this shape: • Quadrilateral, trapezoid

  26. Bonus question • Are all squares also rectangles?

  27. Bonus question • Are all squares also rectangles? Yes

  28. Bonus question • Are all squares also rectangles? Yes • Are all rectangles also squares?

  29. Bonus question • Are all squares also rectangles? Yes • Are all rectangles also squares? No

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