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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 square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.