几何学 jǐhéxué geometry Origin Definitions Defs Strokes Stroke Words Sentences Sents 2 sentences 几何学研究平面和立体的性质。 jǐhéxué yánjiū píngmiàn hé lìtǐ de xìngzhì. Geometry studies the properties of planes and solids. Source: Dong Chinese Dictionary勾股定理是几何学中一个非常著名的定理。 gōu gǔ dìnglǐ shì jǐhéxué zhōng yī gè fēicháng zhùmíng de dìnglǐ. The Pythagorean theorem is a very famous theorem in geometry. Source: Dong Chinese Dictionary