Protractor .
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Well, honey, if you can't see that it's a half-shaded circle, then I don't know what to tell you. Half of the circle is shaded, which means it's a 1/2 fraction. So, grab a ruler if you need to, but trust me, it's half.
A quadrant.
The radius is half of the diameter of a circle.
The Line that divides the earth into two is called the great circle
The area of any circle is (pi) x (radius)2 .The area of half the circle is just half of that number.