证明:在Rt△ABC和Rt△DEF中,
所以Rt△ABC≌Rt△DEF(HL)∴∠ABC=∠DEF
又∵∠DEF+∠DFE=90°∴∠ABC+∠DFE=90°
即两滑梯的倾斜角∠ABC与∠DFE互余.
略