In parallelogram ABCD , what is the measure of ∠ADC?
(1) The measure of ∠ABC is greater than 90
(2) The measure of ∠BCD is 70
(1) This leads to several possible answers, hence insufficient.
(2) ∠BCD + ∠ADC = 180 As we already know that the first one is 70, the second is 180-70. Thus, sufficient.
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