Classifying triangles Written by: James Wiens Newton, Kansas.

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Presentation transcript:

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. Objective/goals: Students will classify triangles according to types or angles and sides.

Standard: ▲ identifies angle and side properties of triangles and quadrilaterals (KS standard 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. Instructor Notes

Lesson Outline I.Warm-up: Angle classification II.Setting the Stage: III.Guided practice: Turning Point Questions IV.Independent practice: Paper & pencil V.Closure: Write about triangles

Classify this angle: a)Acute b)Right c)Obtuse Classify this angle:

a)Acute b)Right c)Obtuse

Classify this angle: a)Acute b)Right c)Obtuse

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.

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.

Setting the Stage 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?

Answer Scalene

Setting the Stage 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?

Answer Acute

Classify this triangle by angles and by sides 1.Acute / Isosceles 2.Obtuse / Isosceles 3.Acute / Scalene 4.Obtuse / Scalene

Classify this triangle by angles and by sides Acute / Isosceles 2.Right / Isosceles 3.Acute / Scalene 4.Right / Scalene

Classify this triangle by angles and by sides 1.Acute / Isosceles 2.Obtuse / Isosceles 3.Acute / Scalene 4.Obtuse / Scalene

Classify this triangle by angles and by sides Acute / Isosceles 2.Right / Isosceles 3.Acute / Equilateral 4.Obtuse / Scalene

Independent Practice

Answer Key for Independent Practice A.Obtuse / Isosceles B.Acute / Equilateral C.Right / Isosceles D.Acute / Isosceles E.Obtuse / Isosceles F.Acute / Equilateral G.Obtuse / Scalene H.Right / Scalene

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

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