Goodness gracious

a²+b²=c²
6²+8²
36+64=100
√100= 10
X = 10

How do u know without the square down that the triangle has °90 ?

Looking

u know that math always say "prove it"

I can see the pixels in this image by zooming in
I can tell when a line isn't 90° when a part of the line shifts 1 pixel
There's no pixel shifting