Question

12. In the diagram below…

What is the length of CB?
1) 3.2
2) 4.8
3) 16.2
4) 19.2

Answer 1

The diagonal of a cuboid is given as

`AB=√(12^2+3^2+4^2)=13`

Using Pythagoras theorem

`\begin{gathered} CB^2=AB^2-AC^2 \\ \\ \Rightarrow CB=√(AB^2-AC^2) \\ \\ \Rightarrow CB=√(13^2-12^2)=5 \end{gathered}`

Correct option is 2