1/4 of a circle is a 90 degree turn
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A quarter of a circle is called a Quadrant.
A full circle is 360o, so a quarter, (one fourth) of a circle is 90o.
Half circle plus quarter circle is equal to three-fourths of a circle. Three-fourths of a circle plus one eighth of a circle is seven-eighths. You still need one more eighth to complete the circle.
There are 90 degrees
It is usually called, "a quarter acre" or "one quarter acre".