A square (or in this case parallelogram) has a measure of 360 degrees. In parallelograms, the opposite angles are congruent therefore: <A = <C and <B = <D. To solve the problem you would do 360 - (<A + <C) then divide by (1/2) since <B and <D are the same. So, 360 - 140 = 220; 220/2= 110. In conclusion, <D = 110. Answer Choice: C
