The measure of the x is 15.
Given
The length of the base is 9 and the perpendicular is 12.
What is the Pythagoras theorem?
Pythagoras theorem states that the square on the hypotenuse of a right-angled triangle is equal in area to the sum of the squares on the other two sides.
The length of the hypotenuse is x.
Therefore,
[tex]\rm (Hypotenuse )^2= (Base)^2+ (Perpendicular)^2\\\\(x)^2=(9)^2+(12)^2\\\\144+81=x^2\\\\x^2 = 144+81\\\\x^2=225\\\\x=15[/tex]
Hence, the measure of the x is 15.
To know more about Pythagoras theorem click the link given below.
https://brainly.com/question/343682
