Traditional Culture Encyclopedia - Photography major - (2009? Zhangzhou) As shown in the figure, △OAB is rotated 80° counterclockwise around point O to obtain △OCD. If ∠A=110°, ∠D=40°, then the degree of ∠α is (
(2009? Zhangzhou) As shown in the figure, △OAB is rotated 80° counterclockwise around point O to obtain △OCD. If ∠A=110°, ∠D=40°, then the degree of ∠α is (
According to the meaning of rotation, the picture is rotated 80° in the counterclockwise direction,
that is, ∠AOC=80°,
and ∵∠A=110°, ∠D=40°,
∴∠DOC=30°,
then ∠α=∠AOC-∠DOC=50°. Therefore choose C.
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