Cis /trans alkenes: diasteroemers and geometric isomers?

[SaintJude]

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Kaplan says:

Cis and trans alkenes are Diastereomers

A few pages earlier they also say:

Geometric isomers are compounds that differ in the position of substituents attached to a double bond or cycloalkanes. In simple compounds with only one substituents on the either side of the double bond, we use the term cis or trans.

So are cis and trans alkenes both diastereomers and geometric isomers?

 

[MedPR]

Yes. A diastereomer is a type of geometric isomer.