bagaimana cara mengerjakan nya??batuan nya tolong

l = t
p = 3l

Luas Permukaan
= 2*p*l + 2*p*t + 2*l*t
= 2*3l*l + 2*3l*l + 2*l*l
= 6l^2 + 6l^2 + 2l^2
=14l^2

350 = 14l^2
350/14 = l^2
25 = l^2
l = 5 cm

p = 3l = 3 * 5 = 15 cm