代码示例6：在主测试中检查是否为直角三角形。

Code Sample 6: Check for right triangle in main test.

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在水库、水电站等工程中，对于弧形钢闸门的稳行性，根据弧门的构造可将主框架视为矩形、梯形和多层三角形框架进定分析。

The stability of steel radial gates used in reservoirs, hydroelectric power stations, etc. is studied by modelling them as rectangular, trapezoidal or triangular frames.

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