Answer:
210.6 [tex]in^{2}[/tex]
Step-by-step explanation:
Area of bottom triangle = bh/2 = 9(7.8)/2 = 35.1
Measure of 1 lateral face = 13(9)/2 = 58.5
Total measure of all 3 lateral faces = 3(58.5) = 175.5
Surface area = 35.1 + 175.5 = 210.6 [tex]in^{2}[/tex]
