The cis configuration is the configuration which shows the similar group in same direction and is shown by green circle.
In diagram, both the hydrogen are present on terminal carbon whereas on other carbon both the carbon are attached to it which indicating the configuration as cis.
only 1 cis configuration is present.
The trans configuration indicates the arrangement of similar group in opposite group and is shown by green circle.
Two trans configuration is present in diagram as in both the configuration, the hydrogen are opposite to each other contributing to trans configuration[tex][/tex].
