Question

find x in the following figure

Answer 1

x+3x=180(linear pair)
4x= 180
x=45

Answer 2

Hey!
Your answer is here
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$x + 3x = 180 \\ 4x = 180 \\ x = \frac{180}{4} \\ x = 45$
x=45°
3x=3×45=135°
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