Learning Objectives:

__Angle Relationships and Triangles__

__Vertical Angles:__

**Vertical Angles** are the angles opposite each other when two lines cross. They are called **“ Vertical”** because they share the same

__Triangle:__

A **Triangle **is a 3 sided **Polygon.** This means a triangle has 3 sides, all of which are straight line segments.

*There are various types of triangle based upon the characteristics of the triangle are as follows:*

1. ** Equilateral Triangle:** A triangle with 3 equal sides and 3 congruent angles is an

2. ** Isosceles Triangle:** A triangle with 2 equal sides and 2 equal angles is

3. ** Scalene Triangle:** A triangle with no pairs of equal sides is

4. ** Right Triangle:** A triangle with one 90 degree angle is a

5. ** Acute Triangle:** A triangle in which all 3 angles measure less than 90 degree is an

6. ** Obtuse Triangle:** A triangle in which one angle is greater than 90 degrees is an

__Measure of Angles of a Triangle:__

The sum of the measures of the angles of any triangle is 180 degrees.

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**Hook questions:**

*1. **What are the Vertical Angles? Why are they called so?*

*2. **What are the different types of Triangles based on sides and angles? Define all the types.*

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