1 is the scene where Xiaoming does sit-ups on fitness equipment. It is a scene in which Xiao Ming moves his upper body from the EM position to the en position perpendicular to the ground.

Pay BC and NE extension lines to f and h respectively.

∵AD⊥CD,BC⊥CD

∴AD∥BC

∴ Quadrilateral AFCD is rectangular.

∴BF=BC-AD=0.4.

∫sinα= BFAB = 0.40 1.30 in Rt△ABF.

∴α≈ 18 .

That is, the inclination angle of AB is about18;

(2)∵NE⊥AF，

∴∠AEH=90 - 18 =72。

∴∠MEN= 180 -∠AEH= 108。

∴MN's length =108×π× 0.85180 ≈1.60 (m).

A: The path length MN of Xiaoming's head movement is about1.60m..