Angles
Beginner · 7 levels, 5 problems each.
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- 01 Beginner
Clearly acute, clearly obtuse
5 problems · 1 min - 02 Beginner
Acute, obtuse, finer angles
10 problems · 2 min - 03 Beginner
Adding the square corner
10 problems · 2 min - 04 Beginner
Adding the straight line
10 problems · 2 min - 05 Beginner
All four kinds
10 problems · 2 min - 06 Beginner
Closer to a corner
10 problems · 2 min - 07 Beginner
Telling them apart
10 problems · 2 min