Answer:
I have never actually seen a zigzag ruler, but I would assume to make zigzag lines.
Explanation:
Dome.
Pitched brick barrel vault.
Barrel vault.
Groin vaults.
Rib vault.
Fan Vault.
Hyperbolic paraboloids.
Answer:
It has allow cultures to provide realistic imagery to future generations.
Explanation:
It is A! He used a atmospheric perspective.
