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Classifying triangles

Classifying triangles. Written by: James Wiens Newton, Kansas. Instructor Notes. Subject Area(s): Math Grade level: 7 th grade Lesson Length: 50 minute class period Synopsis: Name triangles by angles and sides.

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Classifying triangles

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  1. Classifying triangles Written by: James Wiens Newton, Kansas

  2. Instructor Notes • Subject Area(s): Math • Grade level: 7th grade • Lesson Length: 50 minute class period • Synopsis: Name triangles by angles and sides. • Objective/goals: Students will classify triangles according to types or angles and sides.

  3. Instructor Notes • Standard: ▲ identifies angle and side properties of triangles and quadrilaterals (KS standard 7.3.1.k3) • Pre-requisite skills: Vocabulary – Acute, Obtuse, Right, Equilateral, Isosceles, Scalene • TurningPoint functions:standard question slides • Materials: All instructional points and practice problems are provided within the power point slides. Practice questions are designed to be used with the TurningPoint clickers.

  4. Lesson Outline • Warm-up: Angle classification • Setting the Stage: • Guided practice: Turning Point Questions • Independent practice: Paper & pencil • Closure: Write about triangles

  5. :00 Answer Now Classify this angle: • Acute • Right • Obtuse Classify this angle:

  6. Classify this angle: Acute Right Obtuse :10 Answer Now

  7. Classify this angle: Acute Right Obtuse :10 Answer Now

  8. Classify by Angles • Key concept: Classify the triangle by it’s largest angle. • If the largest angle is acute, then the triangle is Acute. • If the largest angle is right, then the triangle is Right. • If the largest angle is obtuse, then the triangle is Obtuse.

  9. Classify by Sides • Key concept: Measure the length of each side. • If all three sides are the same length, then the triangle is Equilateral. • If all two sides are the same length, then the triangle is Isosceles. • If all three sides are a different length, then the triangle is Scalene.

  10. A piece of paper is cut diagonally from corner to corner to form a triangle. What kind of triangle is formed based on the length of it’s sides? Setting the Stage

  11. Answer Scalene

  12. A piece of paper is cut diagonally from corner to corner to form a triangle. What kind of triangle is formed based on the angles formed? Setting the Stage

  13. Answer Acute

  14. :09 Answer Now Classify this triangle by angles and by sides • Acute / Isosceles • Obtuse / Isosceles • Acute / Scalene • Obtuse / Scalene 7 70 4 40 70 7

  15. :10 Answer Now Classify this triangle by angles and by sides 8 • Acute / Isosceles • Right / Isosceles • Acute / Scalene • Right / Scalene 90 30 4 9 60

  16. :10 Answer Now Classify this triangle by angles and by sides • Acute / Isosceles • Obtuse / Isosceles • Acute / Scalene • Obtuse / Scalene 14 130 6 15 35 18

  17. :10 Answer Now Classify this triangle by angles and by sides 7 • Acute / Isosceles • Right / Isosceles • Acute / Equilateral • Obtuse / Scalene 60 60 7 7 60

  18. Independent Practice

  19. Independent Practice

  20. Obtuse / Isosceles Acute / Equilateral Right / Isosceles Acute / Isosceles Obtuse / Isosceles Acute / Equilateral Obtuse / Scalene Right / Scalene Answer Key for Independent Practice

  21. Closure / Summary • Is it possible for an obtuse triangle to also be equilateral? Explain why or why not.

  22. References • All content of lesson designed and written by James Wiens, 7th grade math teacher, Newton Kansas.

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