self Maths Puzzle

The length of the circum-radius of a triangle having sides of lengths 12cm, 16cm and 20 cm is

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self Other Question

There are 4 boxes colored red, yellow, green and blue. If 2 boxes are selected,
how many combinations are therefor at least one green box or one red box to
be selected? The radius of the circumcircle of the triangle made by x-axis, y-axis and 4x+3y=12 is