Răspunsuri

2014-04-17T16:33:37+03:00
A) AB=AC=BC ---->ΔABC=Δechilateral---->Aabc=l²√3 :4=8√3 .√3 : 4 =8 . 9 :4=72:4=18(cm²)
b)m(A)=90--->ΔABC=Δdreptunghic---->Aabc= c1 . c2 :2 =AB.AC:2=4√2 . 6√2 :2=24 .2 :2 =48:2=24(CM²)

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2014-04-17T16:36:11+03:00
A).A=l²√3/4=192√3/4=48√3cm².
b).A=C1·C2/2=4√2·6√2/2=24 cm²
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