Question

Na figura, a// b// c//. Calcule as medidas m e n.

Answer 1

$\frac{3}{5} = \frac{m}{n}$
5m= 3n
sabendo que m+n=12
m =3n/5
3n/5 + n =12
3n+5n /5= 12
12×5= 8n
60=8n
n= 7.5
m= 3×7.5 / 5
m= 4.5