Melissa has a gerbil that lives in a cage in the shape of a rectangular prism. She wants to put a ramp in the cage to give her gerbil exercise. The cage has a length of 70 cm, a width of 35 cm, and a height of 50 cm. How long does the ramp need to be to fit diagonally in the cage? Round the answer to the nearest tenth.(1 point)

Responses

116.3 cm
116.3 cm

60.2 cm
60.2 cm

78.6 cm
78.6 cm

92.9 cm

1 answer

To find the length of the ramp that fits diagonally in the cage, we need to calculate the space diagonal of the rectangular prism (the cage). The formula for the diagonal \(d\) of a rectangular prism with length \(l\), width \(w\), and height \(h\) is given by:

\[ d = \sqrt{l^2 + w^2 + h^2} \]

Using the dimensions provided:

  • Length \(l = 70 \text{ cm}\)
  • Width \(w = 35 \text{ cm}\)
  • Height \(h = 50 \text{ cm}\)

Now we can substitute these values into the formula:

\[ d = \sqrt{(70)^2 + (35)^2 + (50)^2} \] \[ = \sqrt{4900 + 1225 + 2500} \] \[ = \sqrt{8625} \] \[ \approx 92.9 \text{ cm} \]

Therefore, the length of the ramp needs to be approximately 92.9 cm when rounded to the nearest tenth.

The correct response is:

92.9 cm