A line passing through the center and crossing the circle.
Only the diameter can divide the circle in to two equal parts.
great circle
The circle's diameter
It's a chord, unless the 2 parts are equal, when it becomes a diameter.
A line across its diameter
Hemisphere is the right answer
3 2/3
the radius of the circle is 2 units
mid-point
The parallel is called the equator.
The area of a circle can be calculated using the formula pi*(radius^2). So in this case, the area of the circle will be pi*(1^2), which is equal to pi.
The equator divides the earth into two hemispheres, northern and southern. Its latitude is 0 degrees.