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2014-05-04T18:24:46+03:00
AΔABC= AB × AC :2= AB² :2
AΔABC=20CM²
AB²=20 X 2
AB²= 40 cm²
AB=√40
AB=2√10

BC=AB√2=2√10 × √2=4√5
PΔABC= 2√10+2√10+4√5=2√5(√2+√2+2)=4(√10+√5)
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