To find the length of the thread that extends from the top-right back corner of the tank to the bottom-left front corner, we can use the Pythagorean theorem.
Assuming the tank is a rectangular prism, we can define the dimensions as follows:
- Width (length from left to right) = 16 inches
- Height (length from top to bottom) = 12 inches
- Depth (length from front to back) = 35 inches
The spider's thread will form the hypotenuse of a right triangle formed by these dimensions.
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We'll first calculate the horizontal distance from the top-right back corner to the bottom-left front corner. This movement combines the width and depth of the tank. \[ \text{Horizontal Distance} = \sqrt{(16^2 + 35^2)} \] \[ = \sqrt{(256 + 1225)} \] \[ = \sqrt{1481} \] \[ \approx 38.5 \text{ inches} \]
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Next, we use the height to find the length of the thread in 3D space, combining both the vertical and the horizontal components: \[ \text{Total Length} = \sqrt{(38.5^2 + 12^2)} \] \[ = \sqrt{(1482.25 + 144)} \] \[ = \sqrt{1626.25} \] \[ \approx 40.3 \text{ inches} \]
Thus, the length of the thread that the spider would need would be approximately 40.3 inches when rounded to the nearest tenth of an inch.
Assuming this calculation is correct and considering the information given (original dimensions might need verification), the answer might not match the provided options, indicating a potential miscalculation or misunderstanding of the dimensions provided. Please ensure the tank's dimensions are accurate. If you are to select among the options provided (16 in., 12 in., 35 in.), further contexts on the problem might narrow it down, but based on the dimensions provided through conventional methods, none seem to fit. Would you like to clarify or provide further specifics on the tank’s dimensions?