A ranger in an observation tower can see the north end of a lake 15 km away and the south end of the same lake 19 km away. The angle between these two
lines of sight is 104°. How long is the lake? Round your answer to the nearest
tenth.

Idon't know what's the answer lol

How am i goonna know explain

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.