The solution is a simple formulae for the series of Right Triangles starting with 3,4,5,, and all similar triangles The radius of the incircle is give by the sum of the triangle sides divided by 12 So (3 4 5 )/12 Answer = 1 Another way is (3 4Almost everyone knows of the "345 triangle," one of the right triangles found in every draftsman's toolkit (along with the ) This triangle is different from most right triangles because it has three integer edgesThat's a right, scalene triangle 3 , 4 and 5 are called triplets where 'a'=3, 'b'=4 and 'c'=5
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