Question

The radius of the circle passing through the foci of the ellipse$\frac{x^{2}}{16}$+$\frac{y^{2}}{9}$=1 and having its centre at (0, 3):

• A. 4
• B. 3
• C. $\sqrt{12}$
• D. 7/2

Answer 1

Answer: (A)

4

Answer 2

Focii (±$\sqrt{7}$, 0)

r = $\sqrt{(0–\sqrt{7})^{2} + (3–0)^{2}}$

=$\sqrt{7 + 9}$

= 4