Is F={56,777,1,2} a subset of G={2,78,64,333,1,7,56,77,900}?
2 answers:
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Check the picture below.
notice that 146° is sitting on a flat-line, and thus it has a sibling linear angle, namely 34°.
now, recalling that a triangle has a sum of 180° for all interior angles, the missing one is 126°, and incidentally that is a corresponding angle with "c".
