In the regular octagon, the numeric value of the area of the shaded region is twice more than the numeric value of the length of ab. find the area of the unshaded region.

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

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Simplify 24÷(-2)(3)+7 a. -29 b. 3 c. 11