用英语翻译，请问这句话怎么正确表述？

Question

sin30度等于1/2。在直角三角形中，∠α的对边与斜边的比叫做∠α的正弦，记作sinα，即sinα=∠α的对边/∠α的斜边。

Answer 1

Sin 30 is equal to 1 / 2. In a right triangle, the ratio of the opposite side of ∠ α to the hypotenuse is called the sine of ∠ α, which is recorded as sin α, that is, the opposite side of sin α = ∠ α / ∠ α's hypotenuse.

Answer 2

你需要把那个词语发上来，这里边不显示图片，没有办法帮你