The angle sum property states the three angles of any triangle always add to 180 degrees. To find a missing angle, you add the two known angles and subtract from 180. This is a fixed rule, like the measurements for a school uniform blouse—it must be precise. Yet, when I mend a torn quilt, sometimes the patches form shapes that are not perfect triangles, and I must adjust the stitch to make the pieces lie flat, which reminds me that geometry lives not just on paper but in the hands that make things fit.
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