Porisma
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Conic sections

Practice section 1 of 2

Questions 1–6 in this collection

Practice questions

Worked example · 2 of 6

Read a parabola’s vertex and choose an equation

Write down one possible equation of the parabola shown in the diagram.

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A parabola opens left, with vertex labelled (5,−3). Its width is illustrative; determine one possible equation from the vertex and direction.
A parabola opens left, with vertex labelled (5,−3). Its width is illustrative; determine one possible equation from the vertex and direction.
A parabola opens left, with vertex labelled (5,−3). Its width is illustrative; determine one possible equation from the vertex and direction.

CJC · Lecture · Example 2

Solution

Worked example · 3 of 6

An ellipse with equal radii

Write down the equation of the ellipse shown in the diagram.

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An ellipse-shaped closed curve has centre (h,k). A leftwards horizontal radius and a downwards vertical radius are both labelled r. Use these equal lengths to determine its equation.
An ellipse-shaped closed curve has centre (h,k). A leftwards horizontal radius and a downwards vertical radius are both labelled r. Use these equal lengths to determine its equation.
An ellipse-shaped closed curve has centre (h,k). A leftwards horizontal radius and a downwards vertical radius are both labelled r. Use these equal lengths to determine its equation.

CJC · Lecture · Example 3

Solution

Worked example · 6 of 6

Recover a vertical hyperbola from vertices and asymptotes

Find the equation of the hyperbola shown below.

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Centre(−1,2), vertices (−1,5),(−1,−1), asymptotes y=(3/4)x+11/4 and y=−(3/4)x+5/4. Find the hyperbola’s equation.
Centre(−1,2), vertices (−1,5),(−1,−1), asymptotes y=(3/4)x+11/4 and y=−(3/4)x+5/4. Find the hyperbola’s equation.
Centre(−1,2), vertices (−1,5),(−1,−1), asymptotes y=(3/4)x+11/4 and y=−(3/4)x+5/4. Find the hyperbola’s equation.

CJC · Lecture · Example 6

Solution

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