Circles | Geometry (all content) | Math | Khan Academy
Learn about circles, their properties, equations, and applications through interactive lessons and exercises on Khan Academy.
Area of a circle (practice) | Geometry | Khan Academy
Find the area of a circle given its radius, diameter, or circumference.
Circles | High school geometry | Math | Khan Academy
Explore geometry concepts related to circles, including properties, formulas, and applications, through engaging lessons and exercises on Khan Academy.
Circumference of a circle (practice) | Khan Academy
Find the circumference of a circle when given either the radius or diameter. Find the radius or diameter of a circle when given the circumference.
Circles | Integrated math 2 | Khan Academy
Let's go round and round as you explore, prove, and apply important properties of circles. We'll explore circle basics, learn about arcs and their measures, and dive into the cool world of …
Tangents of circles problems (practice) | Khan Academy
Solve problems related to tangents of circles.
Unit circle (practice) | Trigonometry | Khan Academy
Practice your understanding of the unit circle definition of sine and cosine.
Circle equations: foundations (practice) | Khan Academy
The equation of a circle is (x + 6) 2 + (y + 8) 2 = 1 . What are the center and radius of the circle?
Challenge problems: Arc length 2 (article) | Khan Academy
Solve two challenging problems that ask you to find an arc measure using the arc length.
Tangent and secant - Basics (practice) | Khan Academy
Learn the basics of tangents to a circle with interactive exercises and examples on Khan Academy.