Answer: 468 in² B
Explanation:
If you flipped the prism so that the triangle part was on the bottom you
SA= LA +2B
where
LA = lateral area = Ph
P(perimeter) = 15+9+12 = 36
h(height) = 10
LA = 36*10 =360
B= 1/2 bh b=9 h=12 I flipped the triangle so 9 would be base
B=1/2(9)(12)
B=54
SA = 360+2(54)
= 468 in²