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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100 Day Summer Challenge

Keep Off The Grass

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Community

100 Day Summer Challenge

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, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations, examples, and problems from the community.

Used and loved by 4 million people

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

Master advanced concepts through explanations,
examples, and problems from the community.

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

Master advanced concepts through explanations,
examples, and problems from the community.

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