A geometry problem by Adrian Gonzalez

Geometry Level 3

The ratio of the radii of two concentric circumferences is 1:3. If AC is a diameter of the largest circle, BC is a chord of the larger circle that is tangent to the small circle and AB = 18, What is the radius of the larger circle?

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A geometry problem by Adrian Gonzalez

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.