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math homework help? length and width of a TV screen?
question: The screen T.V on a 42 inch LCD TV has an aspect ratio of 15 to 9. Find the length and width of the screen to the nearest tenth of an inch
Answer is: 36 inch, 21.6 inch
but how did they get that?
thanks for your help in advance
1 Answer
- MercyLv 77 years ago
The aspect ratio is expressed as two numbers separated by a colon (x:y). A common misunderstanding is that x and y represent actual width and height. Actually they represent the relation between width and height. As an example, 8:5, 16:10 and 1.6:1 are the same aspect ratio.
http://math.stackexchange.com/questions/180804/how...
aspect ratio = original width ÷ original height
adjusted height = <user chosen width> ÷ aspect ratio