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equation of a circle

an earthquake is one physical phenomenon that can be modelled by a circle. give examples of three other phenomena that can be modelled by circles. include the equations.

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please help!

points (a,5) and (9,b) are on the circle x2+y2=125. what are the values of a and b?

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equation of a circle

Two satellites are orbiting earth. the path of one has the equation x2 + y2 = 2 250 000. the orbit of the other is 200km farther from the centre of Earth. In one orbit, how much farther does the second satellite travel than the first one? read more ..

joan.c Feb 9, 2017