5 sentences

1. 匠人用矩来校准直角。

   jiàng​rén yòng jǔ lái jiào​zhǔn zhí​jiǎo.

   The craftsman used a square to calibrate the right angles.

   Source: Dong Chinese Dictionary

2. 正方形的每个顶点都是直角。

   zhèng​fāng​xíng de měi gè dǐng​diǎn dōu shì zhí​jiǎo.

   Each vertex of a square is a right angle.

   Source: Dong Chinese Dictionary

3. 在直角坐标系中，原点的坐标通常表示为(0,0)。

   zài zhí​jiǎo zuò​biāo​xì zhōng, yuán​diǎn de zuò​biāo tōng​cháng biǎo​shì wéi(0,0).

   In a Cartesian coordinate system, the coordinates of the origin are usually represented as (0,0).

   Source: Dong Chinese Dictionary

4. 勾股定理中的“弦”指的就是直角三角形的斜边。

   gōu gǔ dìng​lǐ zhōng de“ xián” zhǐ de jiù shì zhí​jiǎo sān​jiǎo​xíng de xié biān.

   The 'xian' in the Pythagorean theorem refers to the hypotenuse of a right triangle.

   Source: Dong Chinese Dictionary

5. 在中国古代数学中，直角三角形较长的直角边被称作股。

   zài Zhōng​guó gǔ​dài shù​xué zhōng, zhí​jiǎo sān​jiǎo​xíng jiào cháng de zhí​jiǎo biān bèi chēng​zuò gǔ.

   In ancient Chinese mathematics, the longer leg of a right-angled triangle was called the 'gu'.

   Source: Dong Chinese Dictionary