垂心

vertical center of gravity

垂向重心垂直重心

vertical center of buoyancy 垂直浮心 | vertical center of gravity 垂向重心垂直重心 | vertical center of gravity 垂直重心

orthocenter

垂心

反过来说,证明A,, F, E四点共圆等於解释了为何B会是的内心(同学不妨一试). 不过,笔者在这里想介绍另一种证明内心的技巧. 这是利用轨迹概念去决定内心的一种方法,掌握这方法之后,关於证明垂心(orthocenter)的问题亦可用类似的手法去处理.

orthocenter

垂心, 重心

isothermal curve 等温曲线 | orthocenter 垂心, 重心 | mode interference 波模干扰

orthocentric quadrangle

垂心四边形

orthocentric 垂心的 | orthocentric quadrangle 垂心四边形 | orthocentric tetrahedron 垂心四面体

orthocentric tetrahedron

垂心四面体

orthocentric quadrangle 垂心四边形 | orthocentric tetrahedron 垂心四面体 | orthocomplement 正交补

orthocentric

垂心的

orthocenter 垂心 | orthocentric 垂心的 | orthocentric quadrangle 垂心四边形

orthocentric surface

垂心曲面

垂心 orthocenter | 垂心曲面 orthocentric surface | 正[交]补余 orthocomplement

orthocentric triangle

垂心三角形

orthocentric tetrahedron 垂心四面体 | orthocentric triangle 垂心三角形 | orthodrom e 大圆弧

northwestern paper birch

(近)心形纸桦

西方纸桦 western paper birch | (近)心形纸桦 northwestern paper birch | 垂枝桦 Swedish birch;English birch

orthocentre","intersection of three medians

垂心

"形心","centroid" | "垂心","orthocentre","intersection of three medians" | "原点","orgin"

Supposed to Be：应该吧

我想我该睡了 i think i should slp | 应该吧 supposed to be | 希望 hope so

Plain Weave：平布

509 hopsack 方平织物 | 510 plain weave 平布 | 511 panama 巴拿马薄呢