Not What It Seems

Geometry Level 3

2 circles intersect at $A$ and $B$ .
The tangent to the first circle at $A$ intersects the second circle at $C$ .
The tangent to the second circle at $A$ intersects the first circle at $D$ .
If $B, C, D$ lie on a line, what can we say about $\angle DAC$ ?

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Not What It Seems

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 7 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.