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Anything that has a straight (180 degree) edge. Like a computer screen has 4 straight angles. Or the margin on a piece of paper, that's a straight angle too.
If you draw a straight line on a piece of paper and place a protractor over it you will see the reading is 180 degrees. In this sense a straight angle is 180 degrees.
One can draw a straight line by using a ruler. Should a ruler not be available, one can use the edge of a book or another piece of paper to guide the line straight.
draw a straight line downwards, line an A4 piece of paper next to it and draw around the corner? lol