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Find the midpoint m of z1=(8+5i) and z2=(12+3i)

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab