Respostas

2014-03-18T17:11:28-03:00
Faça uma regra de tres


180graus ---- π-pi
60graus  ------- x


x= x  π rad
2014-03-18T17:12:52-03:00
180°   π rad
60°     x
180x=60π rad
180/60= 3 π rad