In XYZ, X = a + 10, Y = a + 30 and Z = a - 10. Find X.
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Step-by-step explanation:
add all the angles
X + Y + Z = 180 ( angle sum property of ∆)
a + 10 + a + 30 + a - 10 = 180
3a + 30 = 180
3a = 150
a = 50
angle X = a + 10 = 60
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