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30 triangles (1 to the power of 2) + (2^2) + (3^2) + (4^2) = 1 + 4 + 9 + 16 = 30
3 type of triangles are isoceles acute and obtuse triangles.
ALL triangles have three sides !
Only two: -- 1, 1, 3 -- 1, 2, 2
Equilateral triangles have 3 equal sides whereas isosceles triangles have only 2 equal sides