1 / 22

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.

lalo
Download Presentation

Classifying triangles

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related