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Gjois · Answer 1 · 2017-09-29T22:08:48+0000

α - the angle;
We will use C A H method:
cos α = 12 cm / 18 cm = 0.667
α = cos ^(-1) 0.667 = 48.19° ≈ 48° 11`
Answer:
The angle which a line makes with the plane is 48° 11 `

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