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2 years ago

9

Interior and Exterior Triangle Angles (0/5)

1 answer:

sweet-ann [11.9K]2 years ago

8 0

Answer:

<h3> ∠R = 69</h3>

Step-by-step explanation:

<h2>Angle sum property</h2>

Sum of all angles of triangle = 180

5x - 11 + 3x - 3 + 3x + 18 = 180

5x + 3x + 3x -11 - 3 + 18 = 180

Combine like terms

11x + 4 = 180

11x = 180 - 4

11x = 176

x = 176/11

x = 16

∠R = 5x - 11

= 5*16 - 11

= 80 - 11

= 69

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