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Pythagorean Theorem : Point of Tangency

Radio and TV stations broadcast from high towers. Their signals are picked up by radios and TVs in homes within a certain radius. Because Earth is spherical, these signals don't get picked up beyond the point of tangency which could be calculated using the Pythagorean Theorem"

Question: Can you describe how you would calculate the point of tangency?

Solution Summary

The method of calculating the point of tangency is discussed.