Trigonometry and bell: what they have in common

1. Step 1. Trigonometry — evolved from — Euclidean geometry. A development of geometry.
2. Step 2. Euclidean geometry — is used in — Sundial. The scale is marked by the angle of the shadow.
3. Step 3. Sundial — has part — Clock dial. A marked plane with hour lines.
4. Step 4. Clock dial — is part of — Tower clock. Large dials on the faces of the tower.
5. Step 5. Tower clock — has part — Bell. The chime of the clock.

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