[tex]\displaystyle\\ a)~~~m(\sphericalangle 1)=80^o~~si~~m(\sphericalangle 5)=100^o~~\Longrightarrow~~a\cap b \neq \varnothing \\ \text{Explicatie: 1 si 5 sunt unghiuri corespondente inegale}\\\\
b)~~~m(\sphericalangle 2)=100^o~~si~~m(\sphericalangle 5)=100^o~~\Longrightarrow~~a\cap b \neq \varnothing \\
\text{Explicatie: 2 si 1 sunt suplementare, iar 1 si 5 sunt corespondente.}\\
\Longrightarrow~~\text{2 si 5 trebuiau sa fie suplementare.} [/tex]
[tex]\displaystyle\\
c)~~~m(\sphericalangle 5)=90^o~~si~~m(\sphericalangle 1)=90^o ~~\Longrightarrow~~a~||~b \\
\text{Explicatie: 1 si 5 sunt unghiuri corespondente egale} \\\\
d)~~~m(\sphericalangle 6)=120^o~~si~~m(v1)=60^o~~ \Longrightarrow~~a~||~b \\
\text{Explicatie: 6 si 5 sunt unghiuri suplementare.}\\
\Longrightarrow~~ m(\sphericalangle 5) = 180 - 120 = 60^o, \text{ iar 5 si 1 sunt corespondente egale.}
[/tex]
