Quadrilateral jpraquadrilateral jpra is similar to quadrilateral kdewquadrilateral kdew . pr=27 mmpr=27 mm , de=15 mmde=15 mm , and we=25 mmwe=25 mm . what is ar?

The sides that correspond that are listed are PR & DE  and WE & AR. Corresponding sides of similar plolygons are proportional so we can set up a proportion to find the missing side length AR.



substitute



Cross multiply

27*25 = AR*15
 Simplify
675 = 15*AR
Divide both sides by 15

45=AR

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.