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Published bySheena Barton Modified over 7 years ago

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Classifying Triangles

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Classifying Triangles By Their Angles Acute Right Obtuse

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Acute Triangles Acute triangles have three acute angles

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Right Triangles Right triangles have one right angle

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Obtuse Triangles Obtuse triangles have one obtuse angle

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The Sum of Angles in a Triangle The sum of the measures of any triangle is 180°. To find a missing angle in a triangle: 1.Add the two given angles together. 2.Subtract the sum of the two angles from 180 o (since the total of all three angles must equal 180 o ). 55 o 45 o x 55 + 45 100 180 - 100 80 x= 80 o Check your work by adding the 3 angles together. 55 45 + 80 180

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Triangle Degrees The sum of the measures of any triangle is 180°. 70° x What is the measure of x? x= 20 o

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Triangle Degrees The sum of the measures of any triangle is 180°. 45° x What is the measure of x? x= 45 o

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Triangle Degrees The sum of the measures of any triangle is 180°. What is the measure of x? x 60°50° x= 70 o

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