Pictured here is a common green leaf. The two 'veins' of the leaf come from the stem to form two adjacent non-supplementary angles. They are adjacent because they share a side yet are clearly not supplementary, meaning their two angle measures add up to 180 degrees. Leaves can be seen all around us everywhere and everyday. Now, in the winter, there are much less due to the cold climate but in a few months green leaves like this will be budding everywhere. Leaves are not only beautiful but also essential to human life. They create and filter oxygen which we breathe at all times. Leaves are amazing things and have been seen by nearly everyone on the planet. Leaves can come in countless shapes, sizes, and colors.
I found this image online at this address: http://en.wikipedia.org/wiki/Leaf
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