A protractor can help you do this. It has a bar that swings and can measure certain angles.
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That depends. How tough do you think it would be to draw a horizontal line or a slanting line on the wall ?
Draw a line that does not have the same slope of the other line and is not perpendicular too.
First you draw a big multiplication sign, and then you draw another line vertical to the right of the sign (so it intercects both lines), and then you draw the final line horizontally above the sign (so it intercects all three lines), and you have 6 points of intercection :)
Draw an asterisk in it. That is, draw a horizontal line halfway between the top and the bottom, draw a vertical line halfway between the two sides, draw diagonal lines fro the opposing corners.
Any "straightedge" whether it be the side of a book, piece of paper, etc. can be used to create a straight line. Rulers, are common straightedges, as they are tools specifically meant to draw and measure lines.