The first option would be the correct answer because you have the outer angle at 121 degrees and a straight angle adds up to 180 degrees so 121 - 180 = 59. Now you have the original angle on the inside which is 47 degrees and you add 47 + 59 and you get 106. Since this shape is a triangle you would do 180 - 106 to get your last angle which would be 74. Hope this helps!
Area of wall = 9 * 12 = 108 ft^2 Width of TV = x Lenght = 2x Diagonal of TV = 72 " = 6 ft
x^2+(2x)^2=6^2 x^2+4x^2=36 5x^2=35 x^2=36/5 x=sqrt(36/5) Width = 2.68 ft. Length = 2.68 * 5.36 = 14.36 ft^2 Area of wall - area of tv = 108 - 14.36 = 93.64 ft
