Keep Off The Grass

Geometry Level 1

The diagram above shows a big rectangular lawn cut into two smaller rectangles, by the line \(BC\), with dimensions \(3 \times 12\) and \(6 \times 12\) each. What is the length of \(AD?\)

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Keep Off The Grass

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.