Answer:
m∠A = 108º
Step-by-step explanation:
The total of the angles in a four sides figure is 360
x + 2x + 3x + 4x = 360
Combine like terms
10x = 360
Divide both sides by 10
x = 36
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m∠A = 3x
m∠A = 3(36)
m∠A = 108
