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A counter example disproves a statement.
The counter example for : the city of Portland is in Oregon would be : the city of Portland is in Maine.
The city named Portland can be found in both states.
Answer: C. Spherical
Step-by-step explanation:
Riemann's negation was famous for creating a non Euclidean geometry which was spherical. Spherical geometry and it’s principles are being applied in navigation and astronomy. On the spheres, it’s line of structures contains great circles; Unlike other geometrics which are known to be in plane geometry but containing straight lines which are replaced by great circles.
Answer/Step-by-step explanation:
Recall: if two figures are similar, we know that the ratio of their areas = the square of the ratio of their corresponding sides
Apply this knowledge to solve the problems given.
✔️Problem 1 (4-sided polygon):
Let the missing area be x cm²
Therefore,



Multiply both sides by 9
x = 9*4
x = 36 cm²
✔️Problem 2 (3-sided polygon):
Let the missing area be y cm²
Therefore,



Multiply both sides by 240
y = ¹/16 × 240
y = 15 cm²
✔️Problem 3 (5-sided polygon):
Let the missing area be z cm²
Therefore,


Multiply both sides by 40


z = 90 cm²