Download - 24.4.1 弧长和扇形面积
Transcript
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1R,C=2R 31 4140 2OR nl nABO
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1L(mm1mm)
AB
2970mm
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AOCAOC=900C=150OAOACBOA=6AB
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no
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1R,S=R2 31 2OR nS
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O, :
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11202S=_ .2 120R=____ 232cm
S=
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2. 1. 123. 12
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10.6cm0.3cm0.01cmCD = S- S
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0.6cm0.9cm0.01cmABDCE = S+ S
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2A B C D2cm
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ABCaABCa/2D EFS.
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