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**Bell Work Name the Angle in four different ways**

C vertex side 1 1) Use the vertex and a point from each side. ABC or CBA The vertex letter is always in the middle. 2) Use the vertex only. B This only works if there is only one angle at a vertex. 3) Use a number. 1

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**Classifying Triangles**

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**2 Ways to Classify By Side Length By Angle Measurement Equilateral**

Isosceles Scalene By Angle Measurement Right Obtuse Acute

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**Side Length Equilateral**

An Equilateral triangle is a triangle where all three side lengths are congruent. The dashes on the sides of the triangle mean they are the same length (congruent). Remember: Congruent just means equal is the symbol used for congruent.

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Side Length Isosceles An isosceles triangle is a triangle where at least two sides are congruent. The dashes on the sides of the triangle mean they are the same length (congruent).

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Side Length Scalene A scalene triangle is a triangle where all three sides have different measures. The different numbered dashes on the sides of the triangle mean they are all different lengths.

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**Angle Measurement Right**

A right triangle is a triangle that has exactly one right angle. The box in the corner of a triangle represents a right angle. Remember that a right angle is an angle that measures 90⁰.

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**Angle Measurement Obtuse**

An obtuse triangle is a triangle that has exactly one obtuse angle. Remember that an obtuse angle is an angle that is greater than 90⁰.

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**Angle Measurement Acute**

An acute triangle is a triangle where all three angles are acute. Remember that an acute angle is an angle that is less than 90⁰.

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Equiangular Triangle A triangle with all angles equal (60°). The same as an Equilateral Triangle

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**You Try: Obtuse Isosclese Triangle**

Name the triangle by its angles and sides Obtuse Isosclese Triangle

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**Right Scalene Triangle**

You Try: Name the triangle by it’s angles and sides Right Scalene Triangle

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Video

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**We will grade these with ABCD cards at the end of class!**

Practice: Worksheet We will grade these with ABCD cards at the end of class!

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