"trust is like paper, once it's crumpled it can't be perfect again" meaning what?

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

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

A50% increase followed by 33 1/2% decrease