How do you find the sine, cosine, and tangent of a triangle?

You do not.

Those are functions of an ANGLE, not a triangle

They are defined in a right triangle.
If A is one of the two angles that is not 90 degrees then
sin A = opposite side/hypotenuse
cos A = adjacent side / hypotenuse
tan A = sin A/cos A = opposite/adjacent

Thank you!

To find the sine, cosine, and tangent of a triangle, you first need to know the measures of its angles and sides. Let's assume you have a right triangle, where one of the angles is 90 degrees.

1. Sine:
The sine of an angle in a right triangle is the ratio of the length of the side opposite the angle to the length of the hypotenuse.
To find the sine of an angle, you need to divide the length of the side opposite that angle by the length of the hypotenuse.
So, if we denote the angle as θ, the sine of θ can be found using the formula: sin(θ) = opposite/hypotenuse.

2. Cosine:
The cosine of an angle in a right triangle is the ratio of the length of the adjacent side to the length of the hypotenuse.
To find the cosine of an angle, you need to divide the length of the side adjacent to that angle by the length of the hypotenuse.
If we denote the angle as θ, the cosine of θ can be found using the formula: cos(θ) = adjacent/hypotenuse.

3. Tangent:
The tangent of an angle in a right triangle is the ratio of the length of the side opposite the angle to the length of the side adjacent to the angle.
To find the tangent of an angle, you need to divide the length of the side opposite that angle by the length of the side adjacent to it.
If we denote the angle as θ, the tangent of θ can be found using the formula: tan(θ) = opposite/adjacent.

Note: The sine, cosine, and tangent functions can also be used in non-right triangles, but the calculations are more complex and involve the use of the Law of Sines and the Law of Cosines.