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grigory [225]
3 years ago
6

A room in the shape of a triangle has sides of length 7 yd, 8 yd, and 11 yd. If carpeting costs $17.50 a square yard and padding

costs $3.25 a square yard, how much to the nearest dollar will it cost to carpet the room, assuming that there is no waste?
Mathematics
2 answers:
Monica [59]3 years ago
7 0
770 dollars I think I'm not 100% sure
Tpy6a [65]3 years ago
7 0
3. By sketching this triangle it can be determined that this is not a right triangle, but rather an oblique-angled triangle. For the lengths of the three sides, let a = 7, b = 8, and c = 11, and let angle A be opposite side a, and angle B be opposite side b, and angle C be opposite side c. 

<span>Using the Law of Cosines: </span>

<span>cos(A) = (b² + c² - a²)/2bc = [(8)² + (11)² - (7)²)/2(8)(11) = 0.773 </span>

<span>A = acos(0.773) = 39.4° </span>

<span>Using the Law of Sines: </span>

<span>sin(A)/a = sin(B)/b ==> sin(B) = (b/a)sin(A) = (8/7)sin(39.4°) = 0.725 </span>

<span>B = asin(0.725) = 46.5° </span>

<span>Knowing angles A and B, angle C is: </span>

<span>C = 180° - A - B = 180° - 39.4° - 46.5° = 94.1° </span>

<span>Finally, the area is: </span>

<span>Area = (ab/2)sin(C) = [(7)(8)/2]sin(94.1°) = 27.928 yd² </span>

<span>The total cost is (27.928)($17.50 + $3.25) = $579.51 [answer (a)] </span>
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