Triangle det APP

Web application to visualize a triangle for kids, it calculates various properties of triangles like area and its angles.

Screenshot

cos(C) = (a2 + b2 – c2)/ 2ab
cos(A) = (b2 + c2 − a2)/2bc
cos(B) = (c2 + a2 − b2)/2ca
s = (a + b + c)/2
√(s*(s-a)(s-b)(s-c));