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22 December, 01:38

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

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  1. 22 December, 01:40
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    21 inch

    Explanation:

    It means that the length of the diagonal of the TV is 20 inch or 25 inch.

    Width of TV = 28 inch

    diagonal of TV = 35 inch

    Let L be the length of the TV

    Use Pythagorean theorem

    Diagonal^2 = length^2 + width^2

    35^2 = L^2 + 28^2

    L^2 = 1225 - 784

    L^2 = 441

    L = 21 inch
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