Lift a hill through its contours

World 6: From contour map to terrain is part of PRO

The first world of Calculus & Probability is free. PRO opens the other 48 lessons in 6 worlds — simulations, quizzes and all.

• 🔒 Read steepness from a map
• 🔒 Radians: measure an angle by its arc
• 🔒 Amplitude, frequency and phase
• 🔒 The helix: two graphs in one curve
• 🔒 e^(iθ) and the quarter-turn velocity

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly