Quarter circle with degree scale and r-7 rocket: what they have in common

1. Step 1. Quarter circle with degree scale — is part of — Quadrant. A scale from 0 to 90°.
2. Step 2. Quadrant — has part — Plumb bob. A plumb line shows the vertical.
3. Step 3. Plumb bob — has part — Rope. A suspension fibre.
4. Step 4. Rope — is part of — Parachute. The lines are ropes.
5. Step 5. Parachute — is part of — Soyuz. Landing by parachute.
6. Step 6. Soyuz — evolved from — R-7 rocket. The Soyuz rocket belongs to the R-7 family.

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