2 sentences

1. 这间卧室的大小是二十平方米。

   zhè jiān wò​shì de dà​xiǎo shì èr​shí píng​fāng​mǐ.

   The size of this bedroom is twenty square meters.

   Source: Dong Chinese Dictionary

2. 这间卧室的面积大约是二十平方米。

   zhè jiān wò​shì de miàn​jī dà​yuē shì èr​shí píng​fāng​mǐ.

   The area of this bedroom is about twenty square meters.

   Source: Dong Chinese Dictionary