勾股定理的逆定理是证明两条线段垂直的重要理论依据之一，现举例说明它在解题中的应用．例1三角形的三边a、b、c适合a’＋b‘＋c’＋338＝10a＋24b＋26c，则此三角形为（）（A）锐角三角形；（B）等腰三角形；（C）直角三角形；（D）钝角三角形．解由已知得，（a－5）‘＋（b The inverse theorem of the Pythagorean theorem is one of the important theoretical proofs to prove the verticality of two line segments. The application of the inverse theorem to an example is illustrated. Example 1 The three sides a, b, and c of the triangle are suitable for a’ + b’ + c’ + 338 = 10a + 24b + 26c, then this triangle is () (A) acute triangle; (B) isosceles triangle; (C) right triangle; (D) Obtuse angle triangle. Known solution, (a-5) ‘+(b