There is an easy way to check if they are sides of a right triangle using a calculator. The two shorter sides (24 and 143) are sides A and B, while the longest side (the hypotenuse if it ends up being a right triangle) is side C. The triangle is only considered right if A2+B2=C2.
For your question, A2 is 242, which is 576.
B2 is 1432, or 20449.
C2 is 1452, 21025.
20449+576=21025, so This is a right triangle.
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