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ViviWhy did Columbus think he was in the East Indies if he thought the Earth was spherical? Didn't Eratosthenes determine the size of the Earth 2,000 years ago?
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What sphere do you live in?
The sphere that we all live on is called the Earth. (It is not a perfect sphere, but close enough)
What shape is a 3d sphere?
Every sphere is 3D. It's said to be "spherical" in shape.
When was the sphere invented?
The sphere wasn't invented, it was natural, like the Earth is natural
Formula to find out the Earth's surface area?
The Earth is close enough to a sphere, so you can use the formula for a sphere: 4 x pi x r2. "r" is the radius; if you find the diameter of Earth somewhere, divide it by 2 to get the radius.The Earth is close enough to a sphere, so you can use the formula for a sphere: 4 x pi x r2. "r" is the radius; if you find the diameter of Earth somewhere, divide it by 2 to get the radius.The Earth is close enough to a sphere, so you can use the formula for a sphere: 4 x pi x r2. "r" is the radius; if you find the diameter of Earth somewhere, divide it by 2 to get the radius.The Earth is close enough to a sphere, so you can use the formula for a sphere: 4 x pi x r2. "r" is the radius; if you find the diameter of Earth somewhere, divide it by 2 to get the radius.
What is a half sphere of the earth called?
a Hemisphere
