Chu vi căn phòng hình chữ nhật bằng: 2 . (10 + 6) = 32 m.

Do đó, chu vi căn phòng hình vuông cũng là 32 m.

Căn phòng hình vuông có chiều dài cạnh bằng: 32 : 4 = 8 m.

Căn phòng hình vuông có diện tích bằng 8 . 8 = 64 m22.

Do 20213 > 20123 nên $-$20213 < $-$20123.

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I copied it from the internet, sorry.