How much nylon (in square feet) would be needed to make the tent shown, including the bottom? (Round your answer to one decimal place.)

Respuesta :

 took the area of the front triangle and got 30, then added to the area of the back triangle for a total of 60. 
Then the 2 sides and the bottom -- I took 12 x 10 and got 120, multiplied x 3 to get 360, then added 
360 + 60 = 420