Given:
a and b are two legs of a right triangle and c is hypotenuse.
a=3 and c=5
To find:
The value of b.
Solution:
According to the Pythagoras theorem,

Using Pythagoras theorem, we get

Now, putting a=3 and c=5, we get




Taking square root on both sides.


The measure of side of a triangle cannot be negative. So, only value of b is 4.
Therefore, the value of b is 4.