Respuesta :

evgeniylevi

Answer:

900.

Step-by-step explanation:

1) the initial area is: A₀=0.5*base*h;

2) the final area is: A=0.5*(5*base)*(5*h).

It means, that 25A₀=A, then A=900 [cm²].
The answer to this question would be 900cm :)