我非常喜欢数学，我想知道是否有某种交互式的数学应用程序可以让人做到这一点？：
用点构造线条和形状
计算形状的内角和外角以及相交线等
计算线的长度和斜率
计算形状的周长和面积
能准确绘制特定类型的线，例如垂直线、平行线、角平分线、切线和垂直平分线等
通过矢量转换形状的能力
能够反映点、线和圆的形状
能够通过矢量从点放大形状
能够将完成的作品导出为 PNG、动画 GIF 和 HTML 网页格式
我正在运行带有 GNOME 3.18 的 Ubuntu GNOME 15.10。
答案1
GeoGebra正是适合您的应用程序！安装它与：
sudo apt-get install geogebra
描述：
Dynamic mathematics software for education
GeoGebra is a dynamic geometry program. You can do constructions with points,
vectors, segments, lines, conic sections as well as functions and change
them dynamically afterwards. On the other hand, equations and coordinates
can be entered directly.
Support for many geometric constructions is provided, as well as support
for many calculus-based tools (derivatives, osculating circle, ...).
GeoGebra files can be exported in many different formats, or as interactive
applets for web pages.
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