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Test your understanding of {unit name}.

Explore science with Khan Academy's free courses, videos, and exercises in physics, chemistry, biology, and more for a world-class education.

ओह! लगता है कुछ गड़बड़ हो गई। कृपया पुन: प्रयास करें। अरे नहीं, लगता है कोई त्रुटि आ गई है। आपको रिफ्रेश करना पड़ेगा। यदि इसके बाद भी यह समस्या बनी …

Learn statistics and probability—everything you'd want to know about descriptive and inferential statistics.

We have a computer lab, 4 student computers in my room, and I was lucky to pilot our district's 1:1 iPod Touch program. I began the year rotating students through my 4 classroom computers during daily …

Programming is the process of creating a set of instructions that tell a computer how to perform a task. We can program using a variety of computer programming languages, such as JavaScript, Python, …

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In this exercise the students learn about the angles in a same segment of a circle.