Question

Diagonala unui patrat de latura 13 radical 2 cm,este egala cu.....cm

Answer 1

$d = l \times \sqrt{2}$

$d = 13 \sqrt{2} \times \sqrt{2}$

$d = 13 \sqrt{4} = 13 \times 2 = 26$

Answer 2

A pătrat=

$l^{2} = ({13 \sqrt{2} })^{2} = 169 \times 2 = 338 \: cm^{2}$

A pătrat=

$d ^{2} \frac{1}{2} = > d^{2} = 2 \times \: a \: patrat = 2 \times 338 = 676 cm^{2}$

$d^{2} = 676 = > d = \sqrt{676} = 26 \: cm$