Which expression can be used to find the value of x? An upside down scalene triangle A B C. The base side is A B. Side A C is labeled as 9. Side B C is labeled as x. Angle A is labeled as 42 degrees. Angle B is labeled as 29 degrees.

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