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5-1 Classifying Triangles - moshaughnessy - home Triangles have 3 equal sides Isosceles Triangles...

Date post: 20-Mar-2018
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5-1 Classifying Triangles
Transcript
  • 5-1 Classifying Triangles

  • Today we will be learning how to classify triangles according to length of sides and measurement of the angles.

  • First we will learn to classify by the ANGLES

  • Right triangles have ONE right angle

  • Acute Triangles have three acute angles

    Smaller than 90o

    Smaller than 90o

    Smaller than 90o

    Acute Angle

  • Obtuse Triangles have ONE obtuse angle

    Obtuse Angle

  • We will now learn to classify triangles by their sides.

  • If you collapsed all of the sides they would form a line.

    Equilateral Triangles have 3 equal sides

  • Isosceles Triangles have 2 equal sides.

  • Scalene Triangles have NO equal sides.

  • Classifying Triangles by Their Sides EQUILATERAL 3 congruent sides

    ISOSCELES at least two sides congruent

    SCALENE no sides congruent

    EQUILATERAL

    ISOSCELES

    SCALENE

  • 1-3A

    Slide 3 of 3

  • 1-3B

    Slide 3 of 3

  • 1-3C

    Slide 3 of 3

  • 1-3D

    Slide 3 of 3

  • You have now learned that triangles can be classified by either their sides or their angles.

  • 10-1 ANGLES OF A TRIANGLE

  • 1-1A

    Slide 1 of 2

  • 1-2A

    Slide 2 of 2

  • 1-2B

    Slide 2 of 2

  • 1-2C

    Slide 2 of 2

  • 1-2D

    Slide 2 of 2

  • 1-2D

    Slide 2 of 2

  • 1-2E

    Slide 2 of 2

  • 1-2E

    Slide 2 of 2

  • 1-2F

    Slide 2 of 2

  • 1-2G

    Slide 2 of 2

  • 1-2H

    Slide 2 of 2

  • 1-2I

    Slide 2 of 2

  • 1-2J

    Slide 2 of 2

  • 1-2J

    Slide 2 of 2

  • GUIDED PRACTICE for Examples 3 and 4

    5 .

    Find the measures of the acute angles of the right triangle in the diagram shown.

    26 and 64 ANSWER

  • The perimeter of a triangle is 29 cm. The length of the first side is twice the length of the second side. The length of the third side is 5 more than the length of the second side. Find the side lengths and then classify the triangle by its side lengths.

  • The ratio of angle measures of a triangle is 7:16:22. Find the angle measures and then classify the triangle by its angle measures.


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