Find the common difference of the arithmetic sequence.
9, 13, 17, 21, . ..

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What is the location of point g, which partitions the directed line segment from d to f into a 5: 4 ratio? –1 0 2 3

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.