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Re: What is the measure of angle A ? [#permalink]
100mitra wrote:
Correct Option D

Method 1.
Property 1
Two angles are called supplementary angles if the sum of their degree measurements equals 180 degrees (straight line)

Line ADF is a straight line: angle EDC + angle CDF = 180°
Angle EDC = 180° - 80° = 120°
Property 2: opposite angle of parallelogram are Equal
Angle A = Angle EDC = 120°
Angle A = 120°


BUT 180°-80° is not 120°, it is 100°...this change in result would actually change the whole solution to the problem.
Can someone explain?
GMAT Club Bot
Re: What is the measure of angle A ? [#permalink]
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Math Expert
94605 posts