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Triangles I © M. Tallman

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**Equilateral Triangle All three sides are congruent.**

60° 4 inches 4 inches 60° 60° 4 inches All three sides are congruent. All three angles are also congruent, 60°. Note: an equilateral triangle will always have three 60° angles, no matter what the size of the triangle. © M. Tallman

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**Isosceles Triangle 40° 70° 70° Two sides are congruent.**

4 inches 4 inches 70° 70° 3 inches Two sides are congruent. One side has a different length. Two angles are congruent. One angle is different. © M. Tallman

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**All sides are different lengths. All angles are different.**

Scalene Triangle 5.5 inches 3 inches 110° 50° 20° 7 inches All sides are different lengths. All angles are different. © M. Tallman

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**Right Triangle Has one right angle. 90°**

Note: It is not possible for a triangle to have more than one right angle. © M. Tallman

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**All three angles are acute (less than 90°).**

Acute Triangle 70° 50° 60° All three angles are acute (less than 90°). © M. Tallman

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**One angle is obtuse (greater than 90 °) .**

Obtuse Triangle 110° One angle is obtuse (greater than 90 °) . Note: It is not possible for a triangle to have more than one obtuse angle. © M. Tallman

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**Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.**

Classify the Triangle Equilateral, Isosceles, Scalene, Right, Acute, Obtuse. c units Y° X° a units Z° b units scalene obtuse © M. Tallman

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**Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.**

Classify the Triangle Equilateral, Isosceles, Scalene, Right, Acute, Obtuse. 90° Y° c units a units X° b units right scalene © M. Tallman

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**Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.**

Classify the Triangle Equilateral, Isosceles, Scalene, Right, Acute, Obtuse. X° a units a units X° X° a units equilateral acute © M. Tallman

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**Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.**

Classify the Triangle Equilateral, Isosceles, Scalene, Right, Acute, Obtuse. X° b units b units Y° Y° a units isosceles acute © M. Tallman

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**Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.**

Classify the Triangle Equilateral, Isosceles, Scalene, Right, Acute, Obtuse. X° a units b units X° a units right isosceles © M. Tallman

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**Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.**

Classify the Triangle Equilateral, Isosceles, Scalene, Right, Acute, Obtuse. Y° c units a units Z° X° b units scalene acute © M. Tallman

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**Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.**

Classify the Triangle Equilateral, Isosceles, Scalene, Right, Acute, Obtuse. a units a units Y° X° X° b units obtuse isosceles © M. Tallman

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Triangles and Angles Classifying Triangles. Triangle Classification by Sides Equilateral 3 congruent sides Isosceles 2 congruent sides Scalene No congruent.

Triangles and Angles Classifying Triangles. Triangle Classification by Sides Equilateral 3 congruent sides Isosceles 2 congruent sides Scalene No congruent.

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