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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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KA-0152
3 points, difficulty 1 of 3Level 7–8not yet calibrated
In a triangle, one angle measures 30 degrees. Of the other two angles, one is exactly twice the other. What is the largest angle in the triangle?
GEO-05Angles on lines, in triangles, in polygonsalso MOD-01, CFT-02

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