Aspire Faculty ID #14042 · Topic: JAMIA MILLIA ISLAMIA MCA 2019 · Just now
JAMIA MILLIA ISLAMIA MCA 2019

A man running a race course notes that the sum of the distances from two flag posts from him is always $10\,\text{m}$ and the distance between the flag posts is $8\,\text{m}$. The equation of the path traced by the man is:

Solution

Sum of distances from two fixed points (foci) is constant ⇒ ellipse. $2a = 10 \Rightarrow a = 5$ Distance between foci $= 2c = 8 \Rightarrow c = 4$ $b^2 = a^2 - c^2 = 25 - 16 = 9.$ Hence, equation of ellipse: $\dfrac{x^2}{25} + \dfrac{y^2}{9} = 1.$

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