Download Aim: Classify triangles by their side lengths and angle measures

13.1.notebook
April 22, 2016
Aim: Classify triangles by their side lengths and angle
measures
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13.1.notebook
April 22, 2016
Identify Equilateral, Isosceles, and Scalene Triangles
You can classify triangles by the lengths of their sides.
In triangle ABC, all the sides are of equal length. It is an
equilateral triangle.
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13.1.notebook
April 22, 2016
Identify Equilateral, Isosceles, and Scalene Triangles
In triangle DEF, two sides are of equal length. It is an
isosceles triangle.
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Identify Equilateral, Isosceles, and Scalene Triangles
In triangle GHI, the three sides have different lengths. It is a
scalene triangle.
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Guided Learning
Complete the Guided Learning on pg. 213 #1­3 in your
notebooks. You will need to use a ruler.
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Identify Right, Obtuse, and Acute Triangles
You can classify triangles by the measures of their angles.
In triangle PQR, ∠R is a right angle. Triangle PQR is a right
triangle. A right triangle has one right angle.
All the sides of the right triangle are not of equal length. So,
triangle PQR is a scalene right triangle.
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Identify Right, Obtuse, and Acute Triangles
Here is another example of a right triangle.
In triangle ABC, ∠C is a right angle and AC = CB.
Two sides of the right triangle are of equal length. So, triangle
PQR is an isosceles right triangle.
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Identify Right, Obtuse, and Acute Triangles
In triangle STU, the measure of ∠S is greater than 90°. Triangle STU
is an obtuse triangle.
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Identify Right, Obtuse, and Acute Triangles
In triangle XYZ, the measures of all the angles are acute or less
than 90°. It is an acute triangle.
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Guided Learning
Complete the Guided Learning on pg. 215 #4­6 in your
notebooks. You will need to use a protractor.
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