Circle geometry
Use the measurements to find the circle that fits. Work out its radius, then choose from five answers.
Turn the distance between parallel walls into a radius.
6 questions · 5 choices · No time limit
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A tangent touches a circle at one point. Use the labeled measurements, not the apparent size of the drawing. All lengths in a question use the same unit.
Your first answer counts. Read the worked solution before moving on. Complete all six questions to save a result. Solving time excludes feedback and time spent in a hidden tab.
Later levels use the Pythagorean theorem, square roots and circle tangency. Learn a method: Connect the circle centers.
The levels increase the size or complexity of the problems. They have not been calibrated against human performance and do not measure IQ.
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Learn a method
Connect the circle centersUse the measurements to find the circle that fits. Work out its radius, then choose from five answers.
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Optional and off by default. Share starts, completions, replays and error categories. For visits from ChatGPT, starts and completions can also include the first QuickenBrain page and broad country. No answers, drawings or names.
How this data is used