Se considera prisma dreapta abca'b'c' care are la baza triunghiul echilateral de latura ab=6 si inaltimea aa'=3 cm. a)aflati sinusul unghiului format de a'b cu (abc)
b)distanta de la A' la BC
C)masura unhiului dintre planele (A"BC) si (ABC)

Amayoral candidate would like to know her residents’ views on a public open space before the mayoral debates. she asks only the people in her office. her co-workers are an example of a census population convenience sample simple random sample