World 5 · The Shortest Way Round · 7 min · PRO
Great circles
Straight lines on a ball
PRO · Map Lab
World 5: The Shortest Way Round is part of PRO
The first world of Map Lab is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly