Answer:
247.21
Step-by-step explanation:
equation for height : c= a2 + b2
4.82 + 9.32
≈10.46566
equation for surface area: A=5 /4tan(54°)a2+5a /2h2+(atan(54°) /2)2
5 /4·tan(54°)·72+5·7 /2·7.972+(7·tan(54°) /2)2
≈247.21018
round to nearest hundredth: 247.21