The value of the side C of the triangle is 5. 831
To determine the value of the side C, we have to make use of the Pythagorean theorem which states that the square of the longest side of a triangle is equal to the sum of the squares of the other two sides.
Then, we have that;
C² = 5² + 3²
find the square of the values and then substitute, we have;
C² = 25 + 9
add the numbers, we get;
C² = 34
find the square root of the value, we have;
C = 5.831