Scale+Factor

1.a.cross multiply 1 over18 and x over 165. Then, 165/18= 9.17 The model of the Coloseum would be 9.17 in tall.

b.cross multiply 1 over 18 and x over 615. Then, 615/18 and you get 34.17. The model of the Coloseum 34.17 inches long

2.a. cross multiply 1 over 18 and x over 32. Then, 32/18 and you get 1.78. Each floor on the model would be 1.78 inches long.

b. cross multiply 1 over 18 and x over 42. Then, 42/18 and you get 2.33. Each floor on the model would be 2.33 inches tall.

3.a. cross multiply 1 over 18 and x over 287. Then, 287/18 and you get 15.94. The model fighting area would be 15.94 inches long.

b. cross multiply 1 over 18 and x over 180. Then, 180/18 and you get 10. The model fighting area would be 10 inches wide.

c. cross multiply 1 over 18 and x over 15. Then, 15/18 and you get 0.83. The wall on the model around the fighting area would be 0.83 in. tall.

4. cross multiply 1 over 18 and x over 6. Then, 6/18 and you get 0.33. The model gladiators would be 0.33 inches tall.