If m∠4 = (3x)° and m∠8 = (x + 40)°, what is the measure of ∠4? ∠4 and ∠8 are vertical.
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angle 4 =angle8
3x=x+40
2x=40
x=20
angle 4 is 3×20=60
angle 8 is 20+40 =60
3x=x+40
2x=40
x=20
angle 4 is 3×20=60
angle 8 is 20+40 =60
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