STEP - BY - STEP EXPLANATION
What to find?
The value of the variable x.
Given:
Opposite=x
Adjacent = x
Hypotenuse = 5
Step 1
Recall the Pythagoras theorem.

Step 2
Substitute the values into the formula.


Step 3
Divide both-side of the equation by 2.

Step 4
Take the square root of both-side.

ANSWER
3.5