Question

ABCD trapez isoscel AD=DC=BC. Daca B=60 de grade si AB=24 cm calculati perimetrul trapezului

Answer 1

CE si DF _L_ AB

CEB = tr. dreptunghic

<) B =60 grade =>  <)BCE =30 gr. =>BE =BC/2

dar AF =BE =>AF+BE =BC  =>AB =2BC => BC=AB/2 =24/2 =12

=>EF =DC=AD=CB=AF+BE

P abcd =3*12 +24 =36+24 =60 cm