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177 problems, every one written from scratch, every wrong answer carrying the mistake that produces it. 708 explanations in all.

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NUMNumber & Arithmetic
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KA-0170
3 points, difficulty 1 of 3Level 11–12not yet calibrated
What is the size of one interior angle of a regular twelve-sided polygon?
GEO-05Angles on lines, in triangles, in polygonsalso CFT-10, CFT-11

Browse the problems — Kangaroo Atlas