Try not to have a good time ... This is supposed to
be educational - Charles Schulz

Concept 3.2b : Drawing Lines in 3D Space
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Idea:
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OpenGL renders lines by specifying the vertices of
the end points of the line within glBegin(GL_LINES) 
and glEnd().

Experiment:
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Specify enough vertices to render the front of a house
with a door and a sloping roof!

Answer:
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One possible order of vertices is:
glVertex3f(2, -2, 0);    glVertex3f(-2, -2, 0,);
glVertex3f(-2 -2 0);     glVertex3f(-2 2 0);
glVertex3f(-2 2 0);      glVertex3f(2 2 0);
glVertex3f(2 2 0);       glVertex3f(2 -2 0);
glVertex3f(-1 -2 0);     glVertex3f(-1 0 0);
glVertex3f(-1 0 0);      glVertex3f(1 0 0);
glVertex3f(1 0 0);       glVertex3f(1 -2 0);
glVertex3f(-2 2 0);      glVertex3f(-1.5 2.75 0);
glVertex3f(-1.5 2.75 0); glVertex3f(1.5 2.75 0);
glVertex3f(1.5 2.75 0);  glVertex3f(2 2 0);