This is a leaf that can be found on trees outside. The veins on the leaf represent lines. The two lines that connect in the middle and are drawn in black create an angle. The line that comes between the angle is the angle bisector. Leafs can be used in the real world for art projects, they get raked up in the fall, and some can be eaten. Regular people can see and use leaves everyday. Scientist can study them. Leaves are parts of plants which are studied in the biotechnology industry.This image is from the internet.http://2.bp.blogspot.com/_l7pJ_FDPtNk/TAQ6aYViMsI/AAAAAAAAAAU/WtfzVnKIf-0/s1600/LEAF+VEIN.JPG
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