Respuesta:
[tex]A = 216 m^{2}[/tex]
Explicación paso a paso:
[tex]A = \frac{B.h}{2} \\\\Base = 3x + 3\\\\Base = 3.(5m)+3\\\\Base = 18 m\\\\A = \frac{18 m . 24 m}{2} \\\\A = \frac{432 m^{2} }{2} \\\\A = 216 m^{2}[/tex]
