Question

Fie trapezul ABCD (BC║AD).Stiind ca baza AD=21cm,linia mijlocie EF=15cm,aflati baza BC
Ajutooor...!vreau rezolvare clara si corecta dau coronita

Answer 1

ABCD-trapez: EF=linie mijlocie, BC||AD=>$EF= \frac{AD+BC}{2} =\ \textgreater \ BC=EF*2-AD=15*2-21=30-21=9 cm$