Ответы на вопрос:
Ab²=(0-3)²+(6-9)²=9+9=18 ab=3√2 bc²=(4-0)²+(2-6)²=16+16=32 bc=4√2 ac²=(4-3)²+(2-9)²=1+49=50 ac=5√2 cosa=(ab²+ac²-bc²)/2ab*ac=(18+50-32)/2*3√2*5√2=36/60=6/10=0,6
Ab=√[(0-3)²+(6-9)²]=√(9+9)=√18=3√2 bc=√[(4-0)²+(2-6)²]=√(16+16)=√32=4√2 ac=√[(4-3)²+(2-9)²]=√(1+49)=√50=5√2 bc²=ab²+ac²-2*ab*ac*cosa cosa= (ab²+ac²-bc²)/(2*ab*ac) = (18+50-32)/(2*3√2*5√2) = 36/60=3/5
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