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sew
@sew
July 2022
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найдите площадь равнобедрянной трапеции ABCD ,если AB=5 , BC= 12, AD=18
A)30 B)90 B) 60 Г) 120
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avdeevajulia140
S=a+b/2*h. 12+18/2*h=30/2*h=15*h. Чтобы найти h, надо: 18-12:2=6:2=3. По теореме Пифагора: h^2=5^2-3^2= 25-9=16. h=8. S=15*h=15*8=120 :)
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