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The image below shows the 'AOL' building in Dublin - Leaving Cert DCG - Question A-2 - 2019

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The image below shows the 'AOL' building in Dublin. The curve is a hyperbola. The drawing on the right shows the axis AA₁, directrix DD₁, focus F and eccentricity l... show full transcript

Worked Solution & Example Answer:The image below shows the 'AOL' building in Dublin - Leaving Cert DCG - Question A-2 - 2019

Step 1

Locate the vertex

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Answer

The vertex of the hyperbola is located at point A. This is determined as it is the closest point to the directrix (DD₁) and is symmetrical with respect to the focus (F).

Step 2

Location of 3 points outside Latus Rectum

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Answer

To find the three points outside the latus rectum, we can consider points that lie beyond the hyperbola, following the trajectory of the curve above the directrix. Possible coordinates are (3, y₁), (4, y₂), and (5, y₃), where y₁, y₂, and y₃ are values calculated from the hyperbola's equation.

Step 3

Location of 2 points inside Latus Rectum

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Answer

For the two points located inside the latus rectum, we will choose points that lie on the inner part of the hyperbola, specifically points near the focus F, such as (1, y₄) and (2, y₅), calculated using the curve's equation.

Step 4

Draw curve (any = 1)

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Answer

To draw the top portion of the hyperbola, we can plot the vertex A and the identified points, using smooth curves to connect them illustrating the hyperbolic shape, while ensuring the branches properly extend outward at the foci.

Step 5

Draw normal perp. to eccentricity line at P

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Answer

At point P, construct a line that is perpendicular to the eccentricity line by first finding the slope of the line connecting the focus F to P, and then taking the negative reciprocal of that slope to draw the perpendicular line.

Step 6

Bisect angle between eccentricity line and directrix to locate center

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To find the center, draw two segments: one from the focus F to the point where the eccentricity line meets the directrix, and another from F to point P. The angle bisector of these two lines will indicate the center of the hyperbola.

Step 7

Draw required circle

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Answer

The required circle can be drawn with its center located at the point of intersection from the bisector drawn earlier. The radius should be determined such that the circle is tangent to both the hyperbola at point P and the directrix DD₁.

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