Screen Size

Computer screens and television screens are usually measured by the diagonal of
the screen. For example, a screen of size 60 inches would have a diagonal of 60
inches, a width of 52 inches, and a height of 30 inches.
Yoselin would like to install a new screen on a shelf that is 17 inches tall and 50
inches wide. She would like the screen to be the largest size that will fit on the
shelf. She knows the diagonal and width of the 4 screens listed below.

Screen Diagonal Width Height
A 15” 13”
B 22” 19”
C 32” 28”
D 40” 35”

1. Use the Pythagorean Theorem to calculate the height of each screen, and
complete the table.










2. Which screen is the largest that will fit on Yoselin’s shelf?

1 answer

To find the height of each screen using the Pythagorean Theorem, we can use the formula:

\[ a^2 + b^2 = c^2 \]

Where:

  • \(c\) is the diagonal of the screen,
  • \(a\) is the width of the screen,
  • \(b\) is the height of the screen.

Given the width and diagonal of each screen, we can rearrange the formula to solve for the height \(b\):

\[ b = \sqrt{c^2 - a^2} \]

Now we will use this formula to calculate the height for each screen.

Calculations:

  1. Screen A:

    • Diagonal \(c = 15\) inches,
    • Width \(a = 13\) inches. \[ b = \sqrt{15^2 - 13^2} = \sqrt{225 - 169} = \sqrt{56} \approx 7.48 \text{ inches} \]
  2. Screen B:

    • Diagonal \(c = 22\) inches,
    • Width \(a = 19\) inches. \[ b = \sqrt{22^2 - 19^2} = \sqrt{484 - 361} = \sqrt{123} \approx 11.09 \text{ inches} \]
  3. Screen C:

    • Diagonal \(c = 32\) inches,
    • Width \(a = 28\) inches. \[ b = \sqrt{32^2 - 28^2} = \sqrt{1024 - 784} = \sqrt{240} \approx 15.49 \text{ inches} \]
  4. Screen D:

    • Diagonal \(c = 40\) inches,
    • Width \(a = 35\) inches. \[ b = \sqrt{40^2 - 35^2} = \sqrt{1600 - 1225} = \sqrt{375} \approx 19.36 \text{ inches} \]

Completed Table:

| Screen | Diagonal | Width | Height (approx) | |--------|----------|-------|------------------| | A | 15” | 13” | 7.48” | | B | 22” | 19” | 11.09” | | C | 32” | 28” | 15.49” | | D | 40” | 35” | 19.36” |

Finding the Largest Screen that Will Fit:

Yoselin's shelf dimensions are 17 inches tall and 50 inches wide. We need to find the largest screen that fits both the width and height constraints.

  • Screen A (7.48” height): Fits, as 7.48” < 17” and 13” < 50”.
  • Screen B (11.09” height): Fits, as 11.09” < 17” and 19” < 50”.
  • Screen C (15.49” height): Fits, as 15.49” < 17” and 28” < 50”.
  • Screen D (19.36” height): Does not fit, as 19.36” > 17”.

Conclusion:

The largest screen that will fit on Yoselin's shelf is Screen C with a diagonal of 32 inches.