Well, when you plug sin(7) into a calculator, it’s still kinda about a triangle. sin(7) means: if you have a right triangle where the hypotenuse (the diagonal side of a right triangle) is length 1, and the angle between the horizontal side and the hypotenuse is 7, how long is the vertical side?
You can also think of it like the [angles within a circle of radius 1.](https://cdn.kastatic.org/googleusercontent/TSZaYHIv-JZrb7IgquFrsO1b4Ie104YD3TkNCaZQ06I8RsonAVD_ON5L8t6q9DIQspl6s1yEwUTmrd1E2PFm87oCuQ) This diagram uses θ instead of x. As θ changes, the vertical part of the triangle inside the circle changes too, and the length of that vertical part is sin(θ). The length of the horizontal part is cos(θ)
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