zhí jiǎo
意思解释：（Orthogonal）切割四分之一圆的两条半径的交角；两条互相垂直的直线的交角。
角度为90°的角。1607年利玛窦译《几何原本》卷一:“直线垂于横直线之上，若两角等，必两成直角，而直线下垂者，谓之横线之垂线。”1634年《远西奇器图说》卷一:“假如上图圆为地球，中有地心，横有地平线，上有方重，其线过地心交于地…
Angle is the horn of 90 ° . 1607 benefit Ma Dou Yi geometry originally roll one: Pa finishs Ji A Chinese-style unlined garment criticizes sb's faults frankly a screen-like mountain peak finishs slender and delicate of Lie rare irrigates benzene of Shao of Qi Jiang of chasm caries to pull to finish You thes foot of a hill or mountain to fold of melon of of Lie of Cuo of of street of abduct Lu ! 634 year Yuan Xiji implement does the plan say roll one:
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