🔍 Key Concepts
• Relationship between a full circle and a complete waveform cycle
• How sine wave phase is measured in degrees from start back to the same point
• Connection between 0°, quarter-cycle, half-cycle, and three-quarter-cycle points on a sine wave
💭 Think About
• If you start at 0° on a sine wave and move through one full pattern until it repeats, what angle have you turned through?
• Think about the angles that correspond to key sine points: peak, zero crossing, trough, and back to the starting point—how many such segments make up one full pattern?
• How many degrees are there in a full rotation of a circle, and how does one complete sine wave relate to one full rotation?
✅ Before You Answer
• Identify the angle for a full circle in basic geometry
• Map the quarter-cycle points (peak, zero crossing, trough, zero crossing) to their approximate angles
• Confirm that a complete cycle means returning to the exact same point and direction on the wave, not just halfway or three-quarters