by tommywallach Wed Jun 19, 2013 10:43 am
Hey Ghezas,
"Aspect ratio" is defined right at the top of the page. It's the ratio of a screen's width to its height.
So draw this TV. The diagonal is 25, and the ratio of the two perpendicular sides of the resulting triangle are in a ratio of 4:3. That means we can just write 4x and 3x (if that step is unclear to you, read the Ratios chapter in our Word Problems book for more explanation). From there, you only need to use the pythagorean theorem (a^2 + b^2 = c^2) to solve for the two sides, and you can use the result to calculate the area.
Hope that helps!
-t