How did China’s geography affect its development in ancient times?
China was limited in its ability to grow due to the lack of farmland.
China used the bordering seas to spread its culture to other people.
China was isolated by the landforms that blocked it from other regions.
China used its major rivers to spread its power over surrounding people.

the geography of Ancient China shaped the way the civilization and culture developed. The large land was isolated from much of the rest of the world by dry deserts to the north and west, the Pacific Ocean to the east, and impassable mountains to the south. This enabled the Chinese to develop independently from other world civilizations.

Explanation:

“China was isolated by the landforms that blocked it from other regions.“

Explanation: it’s because China was isolated due to the Great Wall of China, and the mountains.

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225