CAN SOMEONE PLEASE HELP ME 10 POINTS!!

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

Say it if the radius of a circle is 6 inches how long is the subtended by an angle measuring 70 degree