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Triangles 11.2

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**Classification by sides**

Equilateral has all sides congruent Isosceles has 2 congruent sides Scalene has no congruent sides

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**Classification by Angles**

Acute has 3 angles less than 90° Right triangle has 1 angle = 90 ° Obtuse has 1 angle greater than 90 ° Equiangular: has 3 congruent angles (is also acute)

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**Right, Scalene Triangle**

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**Right, Isosceles Triangle**

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**Triangle Sum Theorem The sum of the measures of the interior angles of a triangle is 180°.**

B mA + mB +mC = 180° A C

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**Find m<E in triangle DEF if m<D= 62 degrees and m<F= 39 degrees.**

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**The measures of the angles of the triangle XYZ are in the ratio 2:3:5**

The measures of the angles of the triangle XYZ are in the ratio 2:3:5. What are the measurements of the angles?

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**Exterior s (4, 5, and 6) Interior Angles (1, 2, and 3)**

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**Exterior Angle Theorem**

m<D +m<A =180 B C D A

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Find x 95 x 142

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Find X x 108 X+2

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Homework Page (2-26) evens

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