C= 85 degrees / \ / \ a= 160 / \ b= 160 / \ B /_________\ A c
What you're looking for is c so you can add a, b, and c together to get the material. To do this you need to use this formula, otherwise known as Law of Cosines: c^2 = a^2 + b^2 - 2abcosC c^2 = 25600 + 25600 - (2)(160)(160)(cos85) c^2 = 51200 - (51200)(cos85) c^2 = 51200 - (<span>-50400.084) c^2 = </span><span>101600.084 c = 318.749 c + a + b = 638.749 or 639 ft if you're looking for a whole number Keep in mind this answer is if what you're looking for is the perimeter, please let me know if it's the area you are looking for</span>
