Ministry of Education 《Revised Mandarin Chinese Dictionary》

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Word	正方形
Bopomofo	`ㄓㄥ^ˋ` `ㄈㄤ` `ㄒㄧㄥ^ˊ`
Hanyu pinyin	zhèng fāng xíng
Interpretation	四邊相等，四內角為直角的四邊形。