Question

Diagonala unui paralelipiped dreptunghic care are 2 cm , 1 cm si radical din 11 cm are lungimea. . . .cm 

Answer 1

$d= \sqrt{ L^{2} + l^{2} + h^{2} } = \\ = \sqrt{ 2^{2}+ 1^{2}+ \sqrt{11}^{2} } = \\ = \sqrt{4+1+11} = \\ = \sqrt{16}= \\ =4 (cm)$