Modern TVs - Television sets. What does it mean to refer to a 20-in TV set?

Television sets. What does it mean to refer to a 20-in TV set?

Television sets. What does it mean to refer to a 20-in set or a 25-in TV set? Such units refer to the diagnola of the screen. A 35-in TV set also has a width of 28 inches. What is its height? In inches?

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Thats the distance from front to back, from screen to where the wire is. Actually, its a measure of the distance from opposite corners of the screen. Dont ask me why they do it, its totally retarded. Screens have surface area, it cannot be effectively measured in distances. Distance doesnt specify dimensions... it could be a perfect square or a rectangle hundred times wider than high. You cannot extrapolate any additional information. The simplification to a single unit loses a great deal of meaning and quality. Sort of like assessing an entire human personality with a zodiac sign - its totally absurd. The Pythagorean Theorem can be used if you know the width. w² + h² = d² width, height, diagonal (28)² + h² = (35)² And I guess this answer does deserve a down thumb for its heinous unorthodoxy, invalidity and blatant falsity.
The screen measured diagonally.
If your tv is 35 inches diagonally and the width is 28 inches. Then the height would be 21 inches.
Using the pythagorean theorem length^2 + width^2 = diagonal^2 A 35 in set with a width of 28 x^2 + 28^2 = 35^2 x^2 + 784 = 1225 x^2 = 441 x = 21 so the length is 21 in
Use the pythagorean theorum to determine the height if you know the width and the diagonal: a^2 + b^2 = c^2 a^2 + (28)^2 = (35)^2 a^2 + 784 = 1225 a^2 = 441 a = square root of 441 a = 21
This basically Pythagorus' theory, which states that the square of the length of the hypotenuse (the longest side) in a right angled triangle is equal to the sum of the squares of the other two sides. So if d is the diagonal, H is the height and W is the width... d squared = (h squared) + (w squared) You already know the diagonal is 35 inches, and the width is 28 inches, so insert those into the equation... 35 squared = (h squared) + (28 squared) 1225 = (h squared) + 784 Take 784 away from both sides of the equation to leave... 441 = h squared square root of 441 = h 21 = h So the height of a 35 inch TV screen with a width of 28 inches is 21 inches.
A TV screen's "inches" is the diagonal measurement of the screen, from one corner to it's opposite corner. This sounds like a homework problem. In which case, 28" is the bottom leg of the triangle, and 35" is the hypotenuse. You use the Pythagorean Theorem to find the other leg. Leg^2 - hypotenuse^2 = otherleg^2. Plug it in. 35^2 - 28^2 = x^2. 1225 - 784 = x^2 441 = x^2 <--- The answer is the square root of 441, since x is squared. 21 = x The TV set is 21" high. You can also unofficially check this by comparing the height/width to the TV's aspect ratio. 28/21 simplifies down to 4/3, equal to a standard TV's aspect ratio of 4:3.
Since the diagonal of the tv forms a right triangle with the length and width, this calls for the pythagorean theorem: A^2+B^2=C^2, where C is always the diagonal, and A or B is the other side. Plug in: 28^2 + B^2 =35^2 Now simplify and solve for B. 784 +b^2=1225 b^2=441 so b= square root of 441 which = 21
23 inches would seem the closest (m4ybe of by h4lf 4n inch) it will 4lwys be diff between to br4nds of tv m4kers.... I used t4pe me4sure to figgur this'n
Swibs has the correct answer although they wasted most of their answer with that Pythagorean Theorem stuff and the calculation. This is not needed when talking about TV sets. Televsion sets have (or perhaps had) a set aspect ratio. The ratio of width to height was standardized at 4 to 3 so a width of 28 would have a height of 21 (28*3/4). This of course makes specifying screen size by using the diagonal distance perfectly valid. The diagonal, width and height do form a triangle and the sides are in the ratios 4-3-5. Just take the diagonal and divide by 5 and then multiply by 4 to get the width and 3 to get the height. 35 .... 35/5 = 7 .... 7*4 = 28 = width ..... 7*3 = 21 = height 25 .... 25/5 = 5 .... 5*4 = 20 = width ..... 5*3 = 15 = height 20 .... 20/5 = 4 .... 4*4 = 16 = width ..... 4*3 = 12 = height I believe that new sets generally use a 16 to 9 ratio (16-9-18.358 - not as neat as 4-3-5 so someone didn;t give this much thought when they did it) in keeping more with a movie format (which, incidentally, is not fixed). The funny thing about this is that although 16:9 or more extreme ratios make sense on a large screen they do not on the small. It is a fact that human vision is more extended horizontally than vertically but when you go down to the size of a TV it isn't. When I watch widescreen all I think about is what is missing at the top and the bottom. It used to be that the actual film was a standard size and to get the theatre aspect ratio they effectively chop off the top and bottom. People have been duped into this 16:9 stuff not because it has anything to do with the way you perceive things but simply because it is equated with being more modern than the old more squarish type screen. An interesting fact is to consider is what size 16:9 screen you would need to match your old 4:3 screen. You want to make the height the same so that the picture will be the same height and for that we need a little math. 16:9 .... height = 9*D1/18.358 .... D1 is the diagonal size of the new TV 4:3 ...... height = 3*D2/5 ............ D2 is the diagonal size of the old set 9*D1/18.358 = 3*D2/5 D1 = (3/5)(18.385/9)D2 D1 = 1.2238*D2 So your new set would have to be 1.22 times the size of your old IF you want the picture to not be smaller. What does this mean in numbers? Here are some (rounded off): 29 .... 35.5 31 .... 38 53 .... 65 What this means is that if your old set was a 29 incher then you would have to get a 35.5 inch new one in order to keep the picture the same size for your old tapes and stuff. Remember this when shopping for that new wide screen. You need bigger just to stay the same as you had. Of course this is a moot point if all you are going to be watching is 16:9. But just be aware that if you have a 29 inch wide screen that things will be smaller than they were on your old set if the picture includes the full vertical height.