# Classifying Triangles. Classifying Triangles By Their Angles Acute Right Obtuse.

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Classifying Triangles

Classifying Triangles By Their Angles Acute Right Obtuse

Acute Triangles Acute triangles have three acute angles

Right Triangles Right triangles have one right angle

Obtuse Triangles Obtuse triangles have one obtuse angle

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

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

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

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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