Is a Tear that is straigh OBious
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Due to the way paper is made, its fibers tend to run in one direction. If you tear in that direction, along the fibers, the paper tears easily, and the fibers guide the tear to be straight across. If you tear the paper across the fibers, all of the above is untrue.
Cut out any triangle. Tear it into 3 pieces with a corner in eh. You should then be able to put the corners together to make a straight line. So, angles in a triangle add up to 180 degrees.
A straight line.A straight line.A straight line.A straight line.
A straight angle (180 degrees) makes a perfectly straight line. Any degree below 180 degrees (0-179 degrees) is NOT a straight angle NOR a straight line. straight angle = 180 degrees straight angle = straight line 180 degrees
Obovate leaves