Arectangular computer screen is 18 in wide and 11 in high. find the length of its diagonal

I'm not sure if this answer is correct because I haven't done it since 4th grade but I think it's 14 1/2in

Since it is a rectangle, that means that all the corners are 90 degrees.

If we take a rectangle and cut it along the diagonal, that is basically two right triangles.

The diagonal is just the hypotenuse of the triangles

To find the hypotenuse

a^2 + b^2 = c^2
18^2 + 11^2 = c^2
324 + 121 = c^2
445 = c^2
c = sqrt. (445)

Hope this helps!

Ican't do any of the other stuff, but i can get you started. the answer, i believe, is $2.50.