I got you, don’t worry.
This triangle is a right triangle, which means you can use trigonometric ratios to find the value of c. Or you can use the pythagorean theorem. I will show you both ways will give you the same answer.
Pythagorean theorem:
States that a ² + b² = c².
c²= hypotenuse or the longest side of the right triangle.
a ²= a leg any (not hypotenuse)
b ²= a leg (not hypotenuse
Values we have:
b = 15
a= 25
Ignore the leg that says c because they are trying to confuse you by putting the leg as c.
C is typically the hypotenuse
When i put c ² in the equation im talking about the hypotenuse (25)
Okay lets start:
a ² + b² = c².
15 ²+ x= 25
225+b ²= 625
-225 -225
b ²=400
Now take the square root of 400
It equal 20.
So the value c= 20. (Your answer)
I hope this helps. :)