Question

Any help please? :/

Answer 1

The answer is 894cm ². 13 x 9 x 2 + 15 x 9 x 2 + 15 x 13 x 2 = 894

Answer 2

I think it's
$894 \: cm^{2}$
Reason:
2 sides 13 x 9 = 2x13x9 = 234
2 sides 13 x 15 = 2x13x15 = 390
2 sides 15 x 9 = 2x15x9 = 270

234 + 390 + 270 = 894 cm^2