Answer is 197.2 cm^2 is your surface area
Step by step
Break the figure down
You have a bottom, a left side, a top and two right triangle ends
Your formulas are
Rectangle Area = L x W
Triangle Area = 1/2bh
Solve
Bottom = 7 x 10 = 70 cm^2
Left side = 3 x 10 = 30 cm^2
Top = 7.62 x 10 = 76.2 cm^2
Triangle = (1/2)(3)(7) =10.5 cm x 2 triangles =21 cm ^2
Add your figures together
70 + 30 + 76.2 + 21 = 197.2 cm^2 is your surface area