Khan Academy - YouTube
Khan Academy is a nonprofit providing a free, world-class education for anyone, anywhere. Our interactive practice problems, articles, and videos help studen...
概览
收录于
2026年3月18日
学科与领域
math · trigonometry
年级范围
三年级–十二年级（高四）
页面类型
Social
关键词
"free online classes" "math tutorials" "science tutorials" "online education" "video classes" "arts and humanities videos" "online lessons" "online learning"
简介
Khan Academy Overview
- Mission: Providing a free, world-class education for anyone, anywhere.
- Organization Type: Nonprofit.
- Core Offerings:
- Interactive practice problems.
- Educational articles.
- Instructional videos.
- Target Audience: Students globally.
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