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**Triangles By Christine Berg Edited By VTHamilton**

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**Can be classified by the number of congruent sides**

Triangles Can be classified by the number of congruent sides

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Scalene Triangle Has no congruent sides

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**Has at least two congruent sides**

Isosceles Triangle Has at least two congruent sides

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**Has three congruent sides**

Equilateral Triangle Has three congruent sides

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**Can be classified by the angle measures**

Triangles Can be classified by the angle measures

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Right Triangle Has one right angle

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Acute Triangle Has three acute angles

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**Triangle with one obtuse angle**

Obtuse Triangle Triangle with one obtuse angle

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**Cut any shape triangle out of a sheet of paper**

Triangles Cut any shape triangle out of a sheet of paper

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**Tear off the corners. Piece them together by having the corners touch.**

Triangles Tear off the corners. Piece them together by having the corners touch.

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**The corners form what type of angle?**

Triangles The corners form what type of angle?

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**The sum of the angles of a triangle is 180 degrees**

Triangles The sum of the angles of a triangle is 180 degrees

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**To find a missing angle, add up the 2 given angles**

Triangles To find a missing angle, add up the 2 given angles

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**Subtract the sum from 180 and you have the missing angle**

Triangles Subtract the sum from 180 and you have the missing angle

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Congruent Triangles

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**Have the same SIZE and the same SHAPE**

Congruent Triangles Have the same SIZE and the same SHAPE

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**May be flipped and/or rotated**

Congruent Triangles May be flipped and/or rotated

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Congruent Triangles BE CAREFUL WHEN YOU NAME THE SHAPE

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**Name congruent CORRESPONDING parts**

Congruent Triangles Name congruent CORRESPONDING parts (sides and angles) IN ORDER

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**Make sure the letters are in CORRESPONDING order**

Congruent Triangles Make sure the letters are in CORRESPONDING order

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ABC is congruent to DEF B F E D A C

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One for you Name the congruent triangles remembering to name the angles in order F E Z D Y X

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Section 4.1 Classifying Triangles

Section 4.1 Classifying Triangles

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