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  4. The order of the differential equation of all circles whose radius is 4, is ..........

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Q. The order of the differential equation of all circles whose radius is $4$, is ..........

MHT CETMHT CET 2019

Solution:

Let equation of all circles having centre $(a, b)$ and given radius is $4,$ is
$(x-a)^{2}+(y-b)^{2}=4$
Here, number of arbitrary constant in two $(a, b)$ so its order is $2 .$