Explanation:
Pythagoras theorem says that "In a right angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides". As the Hypotenuse side is already yet given and one of the side of a triangle value is given. Now we should find the value for other side of a triangle. In order to find the value of other side, we should use the Pythagoras theorem formula.
AC² = AB² + BC²
Let AC be the Hypotenuse side, AB and BC be the other two sides of a triangle.
Given:-
AC = 5, AB = 3, BC = ?
Use Pythagoras theorem formula
AC² = AB² + BC²
5² = 3² + BC²
25 = 9 + BC²
25 - 9 = BC²
16 = BC²
√16 = BC
BC = 4.