Chapter 7, Conic Sections - Section 7.2 - Ellipses - 7.2 Exercises - Page 563: 45

$\frac{x^2}{1}+\frac{y^2}{4}=1$

Major axis: $Length=2a$ $2a=4$ $a=2$ Minor axis: $Length=2b$ $2b=2$ $b=1$ Foci on y-axis: Major axis in vertical Equation of the ellipse: $\frac{x^2}{b^2}+\frac{y^2}{a^2}=1$ $\frac{x^2}{1^2}+\frac{y^2}{2^2}=1$ $\frac{x^2}{1}+\frac{y^2}{4}=1$