Răspuns:
408 cm²
Explicație pas cu pas:
trapez isoscel
b = 10 cm, B = 24 cm, l = 25 cm
[tex]h = \sqrt{ {l}^{2} - (\frac{B - b}{2} )^{2} } \\ [/tex]
[tex]= \sqrt{ {25}^{2} - {( \frac{24 - 10}{2} )}^{2} } = \sqrt{625 - 49} = \sqrt{576} = 24 \: cm[/tex]
[tex]A = \frac{(b + B) \times h}{2} \\[/tex]
[tex]= \frac{(10 + 24) \times 24}{2} = \frac{34 \times 24}{2} = 408 \: {cm}^{2} \\ [/tex]
