<span>A
parallelogram has four sides having 90 degrees at each corner and the total sum
is 360 degrees. When you have a parallelogram that has an angle of 35 degrees
at D1 and D3, summing the two angles you will have 70 degrees. Subtract 360 by
70 and you will get 290. Then divide it by 2 and you will get an angle of 145
degrees at D2 and D4</span>
Ok so for paralellograms 1. all angles inside are adding up to 360 2. opposite angles are congruent 3. adgacent angles are adding up to 180 so D2=D4 D1=D3=35 D2+D1=180 D2+35=180 D2=145 D2=D4 D4=145
