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The angle between the part of the street before the STOP sign and the part of the street after the STOP sign is usually a straight angle.
A protractor can be used to measure an angle. An angle is basically part of a circle. A complete circle is 360 degrees. A right-angle is 90 degrees, half a circle is 180 degrees, and so on.
That's going to depend on what the rest of it is.
They are straight lines, part s of which form chords of the circle.
Noon is when the sun is overhead or at its zenith for whichever part of the world you are on. The angle would depend on the time of year and your latitude.