Yes you can, but you have to use zig zag lines. Using straight lines there are only four ways to divide a square into two equal parts (along the lines of symmetry).
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http://www.mathhelpforum.com/math-help/advanced-geometry/24389-divide-square-into-7-equal-parts.html
Draw a square and divide it into six equal rectangles, for example: ................................... ... ------------------ ... ... | . | . | . | . | . | . | ... ... | . | . | . | . | . | . | ... ... | . | . | . | . | . | . | ... ... | . | . | . | . | . | . | ... ... | . | . | . | . | . | . | ... ... | . | . | . | . | . | . | ... ... | . | . | . | . | . | . | ... ... ------------------ ... ...................................
Divide each side into three equal parts. Then join the division marks on opposite sides with straight lines parallel to the other side(s).
with a knife... lol... sorry couldn't help it
Draw an 'x' in the square by drawing a straight line from each corner to the opposite corner.