Tony makes a triangle using three sticks of length 20 inches, 21 inches and 28 inches. The triangle Tony makes is a right triangle. True or False?

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In a right triangle the square of the longest side is equal to the sum of the squares of the shorter sides.

[tex]20^2+21^2=28^2 \\ 400+441=784 \\ 841 =784 \\ false[/tex]

The answer is 'false'. The triangle isn't a right triangle.