A straw is placed inside a rectangular box that is 9 inches by 5 inches by 4 inches, as shown. If the straw fits exactly into the box diagonally from the bottom left corner to the top right back corner, how long is the straw? Leave your answer in simplest radical form?

Respuesta :

Answer:

sq rt 122

Step-by-step explanation:

if the box is 9 inches length (base) then this applies

First find the base diagonal then find the furthest top to base diagonal after.

Pythagoras theorem

Base diagonal

9^2 + 5^2 = c^2

(sqrt) of 81+25 = c^2

(sqrt) of 106 = c^2 =  10.29563 inches

= 10.3 inches.

larger diagonal

We note the height is 4inches and we add this again squaring all digits on calculator

10.29563^2 + 4^2 = c^2

(sqrt) 121.999997 = c^2

= 11.045361017187261 = 11.08 = 11.1 inches

Radical form = sq rt 122

The diagonal of the straw in radical form is √122 inches.

What is rectangular prism?

A rectangular prism is a 3-dimensional solid shape which has six faces that are rectangles. A rectangular prism is also a cuboid.

The rectangular box is in the shape of rectangular prism.

For the given situation,

Length of the rectangular box, l = 9 inches

Breadth of the rectangular box, b = 5 inches

Width of the rectangular box, w = 4 inches

The formula to find the diagonal of the rectangular prism is

[tex]d=\sqrt{l^{2}+b^{2}+w^{2} }[/tex]

⇒ [tex]d=\sqrt{9^{2}+5^{2}+4^{2} }[/tex]

⇒ [tex]d=\sqrt{81+25+16}[/tex]

⇒ [tex]d=\sqrt{122}[/tex]

Hence we can conclude that the diagonal of the straw in radical form is √122 inches.

Learn more about rectangular prism here

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