Determine whether angle-angle-angle (AAA) is a valid means for establishing triangle congruence. If AAA is a valid criterion, explain why. If it isn’t valid, use GeoGebra to create a counterexample demonstrating that it doesn’t work and give an explanation. If you construct a counterexample, include a screenshot of your work in your answer.

Evaluate the expression for the given value of the variable 7a - 4a for a =8

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

Which of the following is not a subset of {1,2,3}?