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30 6090 Triangle Calculator . If we draw an median to any side, we will have two congruent triangles, by sss. That is to say, the hypotenuse is twice as long as the shorter leg, and. 30 60 90 Special Right Triangle Calculator Inch Calculator from www.inchcalculator.com If we reflect the 30 60 90 triangle over the y axis, we get an equilateral triangle, congruent to the original one because they share a side. The side length is 12, as 6*2=12. 45 45 90 triangle side or hypotenuse.