The side lengths of a triangle are 5,8 and 12 is this a right triangle? A. no, because 5 + 8 ≠ 12. B. yes, because 5² + 8² = 12². C. no, because 5²+ 8² ≠ 12². D. yes, because 5² + 8² < 12² Step-by-step explanation: Pythagoras theorem states c^2=a^2 + b^2 5^2=25 8^2=64 25+64=89