凹凸性 āo tū xìng ㄠ ㄊㄨ ㄒㄧㄥˋ nap1 dat6 sing3

  • (math.) concavity

Stroke order

Practice writing

Draw 凹 (1 of 3) — stroke by stroke.

Draw each stroke of the character in order using your mouse or finger. A hint appears after three misses.