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Geometry 18 Online
OpenStudy (anonymous):

Using the properties of similar triangles, create a ratio showing the relationship between △ABC and one of the smaller triangles. Cross multiply the ratio to derive a simplified equation. Do not use the altitude you drew (segment f) as part of the equation. then Now use the properties of similar triangles to write the relationship between △ABC and the other similar triangle you drew. Cross multiply the ratio to derive a simplified equation. Do not use the altitude you drew as part of the equation.

Directrix (directrix):

Please post the diagram for this. Thanks.

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