how do you find the hypotenuse of a triangle

depends on what is given

1st place to start would probably be the Pythagorean Theorem. Check it out.

It is across from the 90 degree angle

To find the hypotenuse of a triangle, you can use the Pythagorean theorem. The Pythagorean theorem states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides.

Let's say you have a right triangle with sides a, b, and c, where c is the hypotenuse. The formula for the Pythagorean theorem is:

c^2 = a^2 + b^2

To find the hypotenuse, you need to know the lengths of the other two sides. Once you have the values for sides a and b, you can substitute them into the formula and solve for c by taking the square root of both sides:

c = √(a^2 + b^2)

For example, if side a has a length of 3 units and side b has a length of 4 units, you can find the hypotenuse using the formula:

c = √(3^2 + 4^2)
c = √(9 + 16)
c = √25
c = 5

Therefore, in this example, the hypotenuse of the triangle is 5 units in length.