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| The green piece has been rotated. | ||
| To determine the angle of rotation, measure the angle between the green and blue rulers. | ||
| Both the left and right pictures above give 10°, so θ = 10 (left picture) and φ = 10 (right picture). | ||
| If the rotated pieces are are undistorted copies of the whole, then θ = φ, so measuring one angle suffices. | ||
| The rotations are counterclockwise, so the angles are positive. |
Return to Measuring IFS Pieces.