Figure A represents Earth, with point B its center. Locate the equator on the globe. Sketch and label the equator on Figure A. Label the Northern Hemisphere and Southern Hemisphere on Figure A. Look at the image below.

See Below

Explanation:

For the equator, draw a straight line from point A to point B and keep going until you hit the other side of the circle.

Everything above this line is the northern hemisphere.  Anything below it is the southern hemisphere.