Focus of a Parabola

What is the definition of a parabola in terms of its focus and directrix?

• A parabola is the set of all points that are equidistant from a fixed point and a fixed line.

• A parabola is the set of all points that are closer to the focus than to the directrix.

• A parabola is defined as the set of points where each point is twice as far from the focus as it is from the directrix.

• A parabola is a curve where each point is at a fixed distance from the directrix.

Parabola focus... HINT! Multiply both sides by 36 first to get the squared ( ) by itself!

• A

• B

• C

• D

Find the ordered pair for the focus of the conic pictured.

• (5, 4)

• (3, 6)

• (1, 4)

• (3, 2)

Find the focus and the directrix.

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• 
• 
• 

What is the focus of this parabola?

• (1/2,0)

• (0,1/2)

• (2,0)

• (0,2)

Find the focus of the parabola.

• (5, 4)

• (3, 6)

• (1, 4)

• (3, 2)