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Using the law of cosines: x1^2 = 100^2 + 500^2 - 2*100*500*cos(85) x1^2 = 100^2 + 500^2 - 2*100*500*0.087155743 x1^2 = 251284.4257 x1 = 501.28 Similarly, for the other side, we know that the angle between the tower and the ground is 90+5=95. Using the law