5.5.3 Understand Angle Relationships in Triangles

5.5.3 Understand Angle Relationships in Triangles

Angle Relationships

• An exterior angle of a triangle will be EQUAL to the sum of the two nonadjacent interior angles!

• ​The outside angle of a triangle will be equal to adding the two inside angles that are not touching the exterior angle.

• <W = <z + <Y​

​Exterior Angle

• The three inside angles of a triangle always add up to equal 180

• ​<A + <B + <C = 180

Interior Angles Sum

Let's Practice!

Multiple Choice

Find the missing angle

• 11

• 159

• 31

• 21

Multiple Choice

Find the missing angle

• 79

• 87

• 93

• 137

Multiple Choice

Find the missing angle

• 26

• 45

• 64

• 116

Multiple Choice

Are the triangles similar?

• Yes

• No

Multiple Choice

Are the triangles similar?

• Yes

• No

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