computer screens and television screens are usually measured by 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.

Use the Pythagorean Theorem to calculate the height of each screen
Hypotenuse^2-Leg^2=Leg^2
Given
Screen A
Diagonal 15inches
Width 13 inches
Screen B
Diagonal 22 inches
Width 19 inches
Screen C
Diagonal 32 inches
Width 28 inches
Screen D
Diagonal 40 inches
Width 35 inches

1 answer

To find the height of each screen using the Pythagorean theorem, we can rearrange the theorem for our purposes. The theorem states:

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

Where:

  • \( c \) is the length of the diagonal (hypotenuse),
  • \( a \) is the width (one leg),
  • \( b \) is the height (the other leg).

Rearranging gives us:

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

Thus, the height (\( b \)) can be calculated as follows:

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

Now we can calculate the height for each of the specified screens:

Screen A

  • Diagonal (c) = 15 inches
  • Width (a) = 13 inches

\[ b = \sqrt{15^2 - 13^2} = \sqrt{225 - 169} = \sqrt{56} \approx 7.48 \text{ inches} \]

Screen B

  • Diagonal (c) = 22 inches
  • Width (a) = 19 inches

\[ b = \sqrt{22^2 - 19^2} = \sqrt{484 - 361} = \sqrt{123} \approx 11.09 \text{ inches} \]

Screen C

  • Diagonal (c) = 32 inches
  • Width (a) = 28 inches

\[ b = \sqrt{32^2 - 28^2} = \sqrt{1024 - 784} = \sqrt{240} \approx 15.49 \text{ inches} \]

Screen D

  • Diagonal (c) = 40 inches
  • Width (a) = 35 inches

\[ b = \sqrt{40^2 - 35^2} = \sqrt{1600 - 1225} = \sqrt{375} \approx 19.36 \text{ inches} \]

Summary of Heights

  • Screen A: Height ≈ 7.48 inches
  • Screen B: Height ≈ 11.09 inches
  • Screen C: Height ≈ 15.49 inches
  • Screen D: Height ≈ 19.36 inches

Given that Yoselin’s shelf is 17 inches tall, Screens A, B, C, and D would all fit in terms of height. However, the largest allowable screen by height is Screen D with a height of approximately 19.36 inches, which exceeds the shelf height. Therefore, the largest screen that can fit would actually be Screen C, as its height of approximately 15.49 inches is below the shelf height of 17 inches.