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angle a = 54degrees (corresponding angles)
angle d = 180degrees - 100degrees
= 80 degrees (angle on a straight line)
angle c = angle d = 80 degrees (corresponding angles)
angle b = angle c (vertically opposite angles)
angle d = 180degrees - 100degrees
= 80 degrees (angle on a straight line)
angle c = angle d = 80 degrees (corresponding angles)
angle b = angle c (vertically opposite angles)