How to calculate the actual length and width of a display or TV set in inches

It is calculated on a display.
Inch = 2.54.

Because the ratio of length to width is 16: 9, and the XX inch display is based on diagonal lines.

For ease of conversion, 20 inch is used for calculation.

20 inch x 2.54 cm/inch = 50.80 cm

Set to A and B
Therefore, there are two formulas:

1. A/B = 16/9

2. A ^ 2 + B ^ 2 = 50.80 ^ 2 (ing theorem)

==>

9A = 16b

A ^ 2 + B ^ 2 = 50.80 ^ 2

==>

A = 1.7778b

A ^ 2 + B ^ 2 = 50.80 ^ 2

==>

(1.7778b) ^ 2 + B ^ 2 = 50.80 ^ 2

==>

3.1606b ^ 2 + B ^ 2 = 2580.64

==>

B ^ 2 = 2580.64/4.1606

==>

B ^ 2 = 620.2567

==>

B = 24.9049

We can see that:

A = 1.7778b = 1.778*24.9049 = 44.2759

==>

Length A = 44.2759 cm

Width B = 24.9049 cm

Hence

20 inch display:

The length is about 44 cm
Its width is about 25 cm

---------------------------------------------------------------

Conclusion: Quick Calculation Formula

Length = 1.7778 * width

Width = [(size * 2.54) ^ 2/4.1606] Open again

Address: http://blog.csdn.net/aerchi/article/details/34093497