Sine approximation by line segments.
In some areas the lines resemble the sine function - in others (like the peaks) not so much...
Feel free to play around with the points to get a better fit - its interactive :)
Challenge 22: Congruent Sides and Angles of Triangles
Exterior Angle Theorem Lab
Proving Tri's Congruent (I)
Normal distribution as the limit of the binomial