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Select the direct selection tool (white arrow).
Hold down option and click on the frame of the triangle.
Hold down shift and rotate it 180° or rotate it via the button in the control panel on the top.
Thank you very very much for your answer. I do not know exactly what the difference is to what I was doing all the time but hopefully I will understand it later. Now I can go on working. Is the difference the white arrow or shift?
The shift constrains the turn by 90°–180°–270°.
The white arrow would select a part of the frame or an anchor only.
White Arrow+Option selects the whole frame without content if clicked on the frame’s border.
Black Arrow selects frame and content together.
Thank you again! This explains everything to me perfectly.