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1 is the scene where Xiaoming does sit-ups on fitness equipment. It is the scene in which Xiao Ming moves his upper body from en position to EM position perpendicular to the ground.
( 1) 1.29? (2)

Test analysis: (1) If AE⊥BC is in F, then FC=AD=0.24.

∴BE=BC-FC=0.64-0.24=0.40？ 1 point

In RT△ABE, ∠ AEB = 90,

(2)∠AEM= +90 = 108

∴

Comments: This question examines the arc length formula and belongs to the basic question. As long as you remember the arc length formula clearly and use it well, it is not difficult to get the correct answer.

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