Question

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?

Answer 1

Use that Pythagorean theorem
\[28^{2}+x^{2}=35^{2}\]\[x^{2}=441\]\[x=21\]

Answer 2

using Pythagorean theorem,
\[\sqrt{(c^2 - b^2)} = a\]
where a is your height, using the basic theorem

Answer 3

Let the height be "x":
Equation:
x^2 + 28^2 = 35^2



x^2 = 35^2-28^2
x^2 = 441
x = 21 inches
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