Question: 3. The accompanying figure shows Kepler's method for con- structing a parabola. A piece of string the length of the left edge of the drafting

3. The accompanying figure shows Kepler's method for con- structing a parabola. A piece of string the length of the left edge of

the drafting triangle is tacked to the vertex Q of thetriangle and

the other end to a xed point F. A pencil holds the

3. The accompanying figure shows Kepler's method for con- structing a parabola. A piece of string the length of the left edge of the drafting triangle is tacked to the vertex Q of thetriangle and the other end to a xed point F. A pencil holds the string taut against the base of the triangle as the edge opposite Q slides along a horizontal line L below F. Show that the pencil traces an arc of a parabola with focus F and diIeetrix L

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