Question

aria unui patrat cu diagonala de 18 cm este ....cm la 2

Answer 1

$d = 18 \: cm$

$d = l \sqrt{2}$

$l \sqrt{2} = 18 \: | \div \sqrt{2}$

$l = \frac{18}{ \sqrt{2} }$

$l = \frac{18 \sqrt{2} }{2}$

$l = 9 \sqrt{2} \: cm$

$A = {l}^{2}$

$A = {(9 \sqrt{2} )}^{2}$

$A = 162 \: {cm}^{2}$

Answer 2

d = 18 = l√2 => l = 18/√2 = 18√2/2 = 9√2 cm

A = l² = (9√2)² = 9²(√2)² = 81·2 = 162 cm²