Trigonometry and radio: 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 — Shukhov Tower. The hyperboloid is assembled from straight bars.
3. Step 3. Shukhov Tower — has part — Antenna. A radio tower.
4. Step 4. Antenna — is part of — Radio. An antenna.

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