How to find the length of a right angle side of a right triangle, three angles and one right angle side 15cm? It's been a long time since I left school. I've forgotten trigonometric function, Pythagorean theorem, sine and so on. I've even forgotten the calculation process. Now I have to use it in my work. I'm so helpless Please give me a formula and a detailed calculation process,

Sin a is equal to the opposite side of the bevel
Cos B is the ratio of the adjacent edge to the hypotenuse
The sine value and cosine value can be obtained according to trigonometric function
For example, a 60 degree sine is the root of two, three
The cosine is 1 / 2
Similarly, the sine of 30 degrees is 1 / 2
The cosine value is the root of two, three
The 45 degree sine and cosine are both two-thirds root 2
(actually, there's a table of sine and cosine values to look up. It's in the math book.)

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