Mathematics
Junior High
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2 三角形内角和的應用
如右圖,長方形ABCD中,若<EBF=55°,
則<1+2的度數為何?
A
L1+6A+43+62+60+64=360
43+24=35°
L₁+2=360-LA-Lc-13-24.
:360-90-90-35
=145
1
E
155
BY
2
C
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