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This first rectangle will be the frame of your house. The exact proportions of the rectangle don't matter, but try not to make it too long and thin or your house might not look realistic. Use a ruler or straightedge to draw the rectangle so all of the lines are neat and straight. The base of the triangle should line up with the top of the rectangle. Make the triangle wide enough that the bottom corners extend past the sides of the rectangle. The triangle should be around the same height as the rectangle. If you make it too tall it won't look realistic. To make the chimney, draw a tall, narrow rectangle that extends up off the left side of the roof. Then, draw a smaller, horizontal rectangle on top of it. To make the roof panels, draw evenly-spaced horizontal lines from one side of the roof to the other. The number of panels you draw doesn't matter, but try to keep the space between each panel the same.
Draw a rectangle. Sketch a triangle on top of the rectangle to make the roof. Add a chimney and some horizontal panels to the roof.