The tangent ratio of angle y. Therefore, option C is the correct answer.
We need to find the tangent ratio of angle y.
What is the ratio of tangent in trigonometry?
The tangent ratio is yet another trigonometric ratio for right-angled triangles. The tangent ratio is the ratio of the opposite side to the adjacent side of a right triangle.
That is, tanθ=opposite/adjacent
Now, tan y=20/21
Therefore, option C is the correct answer.
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