2015 · Q95
How many right angled triangles can be formed by joining the vertices of a cuboid ?
Elementary MathematicsTrigonometry
- A24
- B28
- C32
- DNone of the above
Explanation
The 6 faces give 24 right triangles and the 6 diagonal planes give 24 more: 48 in all (verified by enumeration), which is none of 24/28/32. Hence option (d) 'None of the above'.