Are the triangles congruent? If so by what rule. If not, why?

If any two angles and the including side are the same in both triangles, then the triangles are congruent.

The triangles are congruent, first the reason why is because they are the same shape, same size, and have the same angle measurements, but also sides. Hope this helps!

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.