Răspunsuri

2014-04-18T19:03:43+03:00
Se formeaza un triunghi dreptunghic AOB, aplici Pitagora 
AB²=AO²+OB²
AB²=4²+9/2²
AB²=16+81/4
AB²=64+81/4
AB²=145/4
AB=145√4/4
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2014-04-18T20:41:02+03:00