英:['æstrəʊɪd]
美:['æstroʊɪd]
英:['æstrəʊɪd]
美:['æstroʊɪd]
"星形的",1909年,来自希腊语 astroeides,源自 astron "星"(来自 PIE 词根 *ster-(2)"星")+ -oeidēs(见 -oid)。早期作为名词(1897年)。
星形线
1 Construct an animation showing the tangent sweeping out the interior of astroid.
建构一动态绘图:展示星状线的切线所有扫掠过的内部轨迹.
2 Construct rotating cardioid and astroid while remaining orthogonal to each other.
作旋转的心脏线和旋转的星状线,且彼此维持正交.
3 Construct an animation of three concurrent tangents of the astroid.
建构一动态绘图:展示星状线共点的三切线.
4 Construct a linkage to draw the astroid.
建构一连杆绘制星状线.
5 Construct an animation displaying an astroid sliding along three fixed concurrent lines meeting at 120 degrees.
建构一动态绘图:展示星状线的滚动,沿著共点及间隔120度的三切线.