Question

4. Un trapez are bazele de lungimi 12 cm, respectiv 8 cm
şi aria de 70 cm. Lungimea inaltimii trapezului este egala
cu........cm​

Answer 1

A trapez=70 cm²

(B+b)×h/2=70cm²

(12+8)×h/2=70cm²

20×h/2=70cm²

10cm×h=70cm²

h=7cm

Answer 2

Răspuns:

    h = 7 cm

Explicație pas cu pas:

    $\displaystyle\bf\\A_{trapez}=\frac{(B+b)*h}{2}$

    $\displaystyle\bf\\70=\frac{(12+8)*h}{2}$

    $\displaystyle\bf\\70=\frac{\not2\not0*h}{\not2}$

    $\displaystyle\bf\\70=10*h\implies h=70:10=7\:cm$