Draw a house shape. Try drawing other shapes:
Get particular shapes by choosing appropriate coordinate values:
Graphics[Polygon[{{0, 0}, {2, 0}, {2, 2}, {1, 3}, {0, 2}}]]
It may help to turn on the axes:
Graphics[Polygon[{{0, 0}, {2, 0}, {2, 2}, {1, 3}, {0, 2}}],
Axes -> True]
Graphics[Polygon[{{0, 0}, {2, 0}, {2, 2}, {1, 3}, {0, 2}}]]