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2014-09-12T11:17:38+03:00
A ΔABC= 8
AB=4
BC=8

8= AB*BC*sin <B/2

8=4*8*sin <B/2

8=4*4 * sin <B

16*sin <B=8

sin <B=8/16=1/2   => mas<B=30 grade


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