Respuesta :

Answer:

200 square inch

Step-by-step explanation:

Diagonal of a square divides the square into two triangles of equal area.

[tex] \therefore Area \: of \: triangle \\ = \frac{1}{2} \times Area \: of \: square \\ = \frac{1}{2} \times 400 \\ = 200 \: {in}^{2} [/tex]