Calculate the length of AC to 1 decimal place in the trapezium

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

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

The radius of a sphere is 3 inches. which represents the volume of the sphere?