172. assignment (trigonometry)

Two balloons are tethered to one another. The left-hand balloon is tethered with a string along d1 to the ground. The right-hand balloon is tethered to the left-hand balloon with a string along d2. The heights of each balloon, h1and h2, the lengths of each string, d1 and d2, and the orientation angles, theta and phi, are as shown in the figure.

Write an expression for the height of the left-hand balloon, h1, in terms of the given quantities.
Expression   :
h1 = __________________________________________

Write an expression for the height of the right balloon, h2, in terms of h1 and the given quantities. We will define psi = phi - theta.
Expression   :
h2 = __________________________________________

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