Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 2 - No. 11)
Which of the following is the correct formula for calculating the length of a diagonal in a cuboid?
d = a + b + c
d = √(a² + b² + c²)
d = 2(ab + bc + ca)
d = a² + b² + c²
Explanation
d = √(a² + b² + c²)
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