By Mansi Yadav

Verified by Ajay Kumar

An architect is designing a right prism-shaped skylight with a rectangular base measuring 9 cm by 12 cm and a height of 16 cm. Determine the length of the longest diagonal across the prism for structural support planning.

  1. 23 cm

  2. 22.5 cm

  3. 21.93 cm

  4. 20.5 cm

Answer: C

Solution

Solution: The longest diagonal of a rectangular prism is \(d=\sqrt{l^2+b^2+h^2}\). Therefore, \(d=\sqrt{9^2+12^2+16^2}=\sqrt{81+144+256}=\sqrt{481}\approx21.93\) cm. Trick: Square all three dimensions, add them, and take the square root.

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