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Calculus- Early Transcendentals, 2021a

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26 Review<br />

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• (h,k) is the vertex of the parabola.<br />

• a is the horizontal stretch factor.<br />

•Ifa > 0, the parabola opens right.<br />

•Ifa < 0, the parabola opens left.<br />

Circle: The equation of a circle is:<br />

(x − h) 2 +(y − k) 2 = r 2 <br />

<br />

• (h,k) is the centre of the circle.<br />

• r is the radius of the circle.<br />

Ellipse: The equation of an ellipse is:<br />

(x − h) 2 (y − k)2<br />

a 2 +<br />

b 2 = 1<br />

<br />

• (h,k) is the centre of the ellipse.<br />

• a is the horizontal distance from the centre to the edge of the ellipse.

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