d = distance between moon and sun, which in this problem is the hypotenuse of a right triangle.
the distance y is the side opposite to angle x in the right triangle. use the definition of the sine function from basic trigonometry.
sin(x) = y/d ⇒
d = y/sin(x)
Answer from: Quest
1. 3. can also be expressed as (22/7)
2. -4.5
3. 3.6
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