There is a right triangle with two angles 30 and 60 degrees. The length of hypotenuse is x and other sides are y and 21. Find y.
Choices:
A:21
B:21 \sqrt { 2 }
C:21 \sqrt { 3 }
D:42
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: There is a right triangle with two angles 30 and 60 degrees. The length of hypotenuse is x and other sides are y and 21. Find y.
Choices:
A:21
B:21 \sqrt { 2 }
C:21 \sqrt { 3 }
D:42
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: There is a right triangle with two angles 30 and 60 degrees. The length of hypotenuse is x and other sides are y and 21. Find y.
Choices:
A:21
B:21 \sqrt { 2 }
C:21 \sqrt { 3 }
D:42