Fie CM - h (inaltimea) (CM perp. pe AB)
M <- (AB).
MB= AB- CD/ 2.
= 25-7/2
= 9 cm => AM = 16 cm => CM=
[tex] \sqrt{am\times em} [/tex]
=
[tex] \sqrt{16 \times 9} [/tex]
= 12 cm
=> T.C ca CB =
[tex] \sqrt{mb \times ab} [/tex]
=
[tex] \sqrt{9 \times 25} [/tex]
= 15 cm => Ptrapez = AB+BC+CD+DA = 25+15+7+15 = 62 cm.
Atrapez= (B+b)*h/2 = (AB+CD) * CM /2 = 32*12/2 = 192
[tex] {cm}^{2} [/tex]
Sper ca te-am ajutat!
