What is the diagonal length of the TV, if it is 45.25 inches wide and 25.5 inches tall?

Diagonal length is a line from a left corner to a right in a rectangle or square.

Basically making two triangles.

You use the equation a^2+b^2=c^2

So 45.25^2+25.5^2=x^2

2,047.5625+650.25=x^2

2,697.8125=x^2

Then square root them both

51.9404707=x

And when rounding to the nearest number the diagonal length is 52 inches