Ascending Crescent

Geometry Level 2

Diagram above shows two circles are tangent internally to each other. The straight lines \(AB\) and \(CD\) are perpedicular and the point \(O \) is the center of the larger circle. The length of straight lines \(AP \) and \(CQ\) are \(4\text{ cm} \) and \(3\text{ cm} \) respectively. What is the radius of the smaller circle?

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Ascending Crescent

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.