Ellipse
Properties of Ellipse
Grade 11
Question:
<p>Find the length of major axis of the ellipse with foci S and S′ at <span>(2, 1)</span> and <span>(4, 1)</span> and tangent line <span>x + y = 9</span>.</p>
<p>(a) <span>\sqrt{13}</span></p>
<p>(b) <span>2\sqrt{11}</span></p>
<p>(c) <span>2\sqrt{13}</span></p>
<p>(d) <span>4\sqrt{3}</span></p>
Step-by-Step Solution
Key Concept: Use the tangent condition and focal properties of the ellipse to determine the major axis length 2a.
<p>Solution not provided in source material.</p>
Correct Answer: C