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22 votes
A) 15

B) 5

C) 12

D) 3

A) 15 B) 5 C) 12 D) 3-example-1
User Erlinda
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2 Answers

4 votes
The answer is: C(12)
User Jelle
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8 votes
By exterior angle of triangle:
17x+4+8x+1=80
x=3
User Candino
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