So for this, remember that
1. a property for parallelograms is that opposite angles are congruent
and 2. all angles add up to 360
Using this info, we can form the equation [tex] 136*2+x*2=360 [/tex]
So firstly, solve the multiplications: [tex] 2x+272=360 [/tex]
Next, subtract 272 on each side: [tex] 2x=88 [/tex]
Finally, divide 2 on each side of the equation, and your answer should be [tex] x=44 [/tex]
In short, ∠BCD is 44°
