Math 121 TR W 12 1. A triangular plot of land is for sale. The sides are lengths 100 m, 150 m, and 210 m. Find the area of the plot of land. If land in the area typically sells for $50 per square meter, how much can they expect for this land? 2. Solve the following equations, and write your solutions in general form. 2𝑐𝑜𝑠 % 𝜃 + 3𝑐𝑜𝑠𝜃 + 1 = 0 sin 2𝜃 +
3. Given sec 𝑥 = 3 and 67
%
< 𝑥 < 2𝜋, find the following: sin 𝑥 cos 2𝑥 sin
𝜋
2
= − 5
2
𝑥
𝑥
tan
2
2
4. A boy flies two kites, holding them both in the same hand. One kite has a string that is 380 ft, and the other 420 ft. The angle between the two kites is 30°. Find the distance between the two kites. €
5. Using the diagram below, find the distance from the person to the helicopter, as well as the distance from the person to the boat.