Pie Studios
Choose a topic
Eleven topics, in a sensible order. Each one has a short lesson and an endless supply of practice problems, most with a diagram, that get harder as you improve.
Level 1
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Shape Lab
Drag the corners of the triangle (or focus one and use the arrow keys). Its sides, angles, perimeter and area update as you go. Hit the challenge for XP.
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Type
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Mixed quiz
Ten questions drawn from the topics you have practised. No hints, no worked steps — just you and the shapes. You can review every answer at the end.
Results
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Total XP
Mastery by topic
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