11 sentences

1. 勾三股四弦五。

   gōu sān gǔ sì xián wǔ.

   In a right triangle, the legs are 3 and 4, and the hypotenuse is 5.

   Source: Dong Chinese Dictionary

2. 勾股定理是几何学中一个非常著名的定理。

   gōu gǔ dìng​lǐ shì jǐ​hé​xué zhōng yī gè fēi​cháng zhù​míng de dìng​lǐ.

   The Pythagorean theorem is a very famous theorem in geometry.

   Source: Dong Chinese Dictionary

3. 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

4. 他的衣服被树枝勾住了。

   tā de yī​fu bèi shù​zhī gōu zhù le.

   His clothes were caught on a branch.

   Source: Dong Chinese Dictionary

5. 你勾得到我的手吗？

   nǐ gōu de dào wǒ de shǒu ma?

   Can you reach my hand?

   Source: OpenSubtitles

6. 你和她勾搭上了吗？

   nǐ hé tā gōu dā shàng le ma?

   Did you hook up with her?

   Source: OpenSubtitles

7. 这两个人内外勾通，把公司的公款给私吞了。

   zhè liǎng gè rén nèi​wài gōu tōng, bǎ gōng​sī de gōng​kuǎn gěi sī​tūn le.

   These two people colluded from within and without to embezzle the company's funds.

   Source: Dong Chinese Dictionary

8. 勾先生是我的同事。

   Gōu xiān​sheng shì wǒ de tóng​shì.

   Mr. Gou is my colleague.

   Source: Dong Chinese Dictionary

9. 他在名单上勾掉了几个人的名字。

   tā zài míng​dān shàng gōu diào le jǐ gè rén de míng​zi.

   He crossed several names off the list.

   Source: Dong Chinese Dictionary

10. 这张老照片勾起了我对童年的回忆。

    zhè zhāng lǎo zhào​piàn gōu qǐ le wǒ duì tóng​nián de huí​yì.

    This old photo evoked memories of my childhood.

    Source: Dong Chinese Dictionary

11. 他们两个私下里经常做一些见不得人的勾当。

    tā​men liǎng gè sī​xià​lǐ jīng​cháng zuò yī​xiē jiàn​bu​dé​rén de gòu dàng.

    The two of them often engage in shady dealings in private.

    Source: Dong Chinese Dictionary