Răspunsuri

2014-04-30T13:15:09+03:00
ABCD trapez isoscel,  AB // CD, AB = 4, CD = 10, h =5, Aabcd = 35,  BC = DA
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Pabcd
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Pabcd = AB + CD +2 * AD

AD = √ ( h^2 + ((CD - AB) / 2 )^2 ) = √ ( 25  + 9) = √34 => Pabcd = 14 + 2*√34