Leonard did this work to solve an equation. did he make an error?

Weak battery is considered to be a part of routine a. inspection b. wear and tear c. maintenance d. check

Determine the volume of a cylinder bucket if the diameter is 8.5 in. and the height is 11.5 in.

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.