Resources for Teaching Mathematics

M.3.3.3 Use informal visual methods to describe and compare shape, dimension, perimeter, area, angles, and sides in 2-D and 3-D objects. M.3.3.4 Identify properties, locations, and functions of right angles, i.e., know that a right angle is 90 degrees or a quarter turn, that two right angles make a straight line, and four right angles fill a space. ................
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