The length of side x on the right triangle below is
.
In a right-angled triangle, you can use the Pythagorean Theorem to find the length of the hypotenuse (c) when you know the lengths of the other two sides (legs), a and b. The Pythagorean Theorem is given by:
c^2 =a^2 +b^2
In this case, the base (a) is 5 units, and the height (b) is 3 units. Let's substitute these values into the formula:
c^2 =5^2 +3^2
c^2 =25+9
c^2 =34
Now, to find c, take the square root of both sides: c=

So, the length of the hypotenuse (x) is
units.