Given that,
x = h + r cos(α)
i.e. r cos(α) = x - h.......... (1)
And,
y = k + r sin(α)
i.e. r sin(α) = y - k.......... (2)
.
Now by squaring and adding, both the equations, we get,
r2cos2(α) + r2sin2(α) = (x - h)2 + (y - k)2
i.e. r2(cos2(α) + sin2(α)) = (x - h)2 + (y - k)2
i.e. r2 = (x - h)2 + (y - k)2
i.e. (x - h)2 + (y - k)2 = r2
.
.
So the required rectangular equation is,
(x - h)2 + (y - k)2 = r2
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