How is the size of earth measured?

Answer 1

The arc to the visible horizon, from height h subtends an angle #theta#, at the center of Earth, The Earth radius r is given by the implicit formula #cos(theta) = r / (r + h)#.

The angle #theta# can be obtained from the arcual distance s of the visible horizon and r, using #theta# radian = s / r. There are iterative numerical methods to solve this r-implicit equation cos#(theta) = r / (r + h)#, using a starter (estimated) value for r. There are alternative methods for which observations are to be made against two conveniently chosen s values.The formula here will be explicit.
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Answer 2

The diameter of the Earth, which is roughly 12,742 kilometers (7,918 miles), is used to calculate the size of the planet.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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