Apps can be a great way to help students with their algebra. Let's try the best 30 60 90 triangle formula geometry.

As shown in the figure above, two congruent 30-60-90 triangles, ACD and BCD, share a side along their longer leg. Since ∠BCD = ∠ACD = 30°, ∠BCA = 60°. Also ∠CAD = ∠CBD = 60°, therefore

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