If a triangle has a right angle (90 degrees), it is called a right triangle. The side opposite the right angle is called the hypotenuse, and it is the longest side of the triangle. The other two sides are called the legs.
To find the length of the third side of a right triangle, we can use the Pythagorean theorem, which states that in a right triangle, the sum of the squares of the two legs is equal to the square of the hypotenuse.
The Pythagorean theorem can be written as:
a^2 + b^2 = c^2
where a and b are the lengths of the two legs, and c is the length of the hypotenuse.
But you already know c, and with that c^2, you want to find a through a^2(you can also look for b, it would be the same)
If you rearrange the equasion you get a^2=c^2-b^
Once we have these lengths
c=15,so c^2 is 15^2=15*15=225
b=10,so b^2 is 10^2=10*10=100
we can plug them into the Pythagorean theorem and solve for the unknown side.
a^2=c^2-b^2
a^2=225-100=1125
If a^2 is 125, then a must be the square route if 125
(a is in you case x)
We