The illuminati sign at the top of the triangle grabbed my students attention. They are all obsessed with it for some reason.

I asked my students if they could think of a way to remember how to differentiate the inequalities for acute and obtuse. I just thought of a triangle everyone can identify. What's true about all of them? They are similar, three 60 degree angles, and three congruent side lengths. 3 sides of 3 would be 3 squared plus 3 squares which is 9+9 which is 18 and greater than the third side squared: 3 squared which would be 9.

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