Question

calcule a medida da diagonal desta figura.

Answer 1

Seja $d$ a medida dessa diagonal.

Pelo Teorema de Pitágoras, $d^2=12^2+9^2$.

$d^2=144+81$

$d^2=225$

$d=\sqrt{225}$

$d=15~\text{cm}$.

Answer 2

cONSIDERANDO
a²=b²+c²
a²=9²+12²
a²=81+144
a²=√225=15 cm