What is the correct way to name the straight angle in the figure

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Teacher's manual for freehand drawing in intermediate schools. the lines which formthese angles. The lines .shouldbe firm, not wavering ; giay, notblack ; and of equal size through-out their whole length.

7. Name the obtuse angle in the figure below.Pleasee ​

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Solved A) How many different rays are in this figure? Name

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