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i ) y = 100° ( opp. ∠s )
angle sum prop.
x + y + z = 360°
x = z = 80° ( opp. ∠s )
ii ) z = 180 - 50 = 130° ( linear pair )
angle sum prop .
x + y + z = 360
y = x = 130 ° ( opp. ∠s )
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