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Learning about angles (what are angles, how to calculate what angles we have).
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greater than 90 degrees but less than 180 degrees
We distinguish the angles:
zero - the angle measure is 0 degrees,
sharp - the angle measure is greater than 0 degrees but less than 90 degrees,
straight - the measure of the angle is 90 degrees,
obtuse - the angle measure is greater than 90 degrees but less than 180 degrees,
semi-full - the angle is 180 degrees,
concave - the angle measure is greater than 180 degrees but less than 360 degrees,
full - the measure of the angle is 360 degrees.
greater than 180 degrees but less than 360 degrees
more than 0 degrees but less than 90 degrees
90 degrees