Geometric Construction 4

  1. Let $A$ be a fixed point on the circle. For a variable point $B$ on the circle, construct the point $C$ so that angle $AOB=$ angle $BOC.$ Find the locus of the line segment $BC$ as $B$ varies over the circle.
    MATH

  2. Let $A$ be a fixed point on the circle. For a variable point $B$ on the circle, construct the point $C$ so that angle $BOC=2$ angle $AOB.$ Find the locus of the line segment $BC$ as $B$ varies over the circle.
    MATH

  3. Let $A$ be a fixed point on the circle. For a variable point $B$ on the circle, construct the point $C$ so that angle $COA=2$ angle $AOB.$ Find the locus of the straight line $BC$ as $B$ varies over the circle.
    MATH

  4. Let $A$ be a fixed point on the circle. For a variable point $B$ on the circle, construct the point $C$ so that angle $COA=3$ angle $AOB.$ Find the locus of the straight line $BC$ as $B$ varies over the circle.
    MATH

  5. Let $A$ be a fixed point on the circle $O$. For a variable point $B$ on the circle, construct the circle with center $B$ passing through $A.$ Find the locus of the circle $B$ as $B$ varies over the circumference of circle $O.$
    MATH

  6. Let $A$ be a fixed point on the circle $O$. For a variable point $B$ on the circle, construct the circle with center $B$ tangent to the straight line $OA.$ Find the locus of the circle $B$ as $B$ varies over the circumference of circle $O.$
    MATH

  7. Let $D,E$ be the orthogonal projections of a variable point $C$ on the circle upon two fixed mutually perpendicular diameters. Find the locus of the line segment $DE$ as $C$ varies over the circle.
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  8. As in the above construction, find the locus of the foot of perpendicular dropped from $C$ upon $DE,$ as $C$ varies over the circle.
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  9. Let $D$ be a fixed point inside the circle. Construct the perpendicular bisector of $CD,$ where $C$ is a variable point on the circle. Find the locus of this perpendicular bisector as $C$ varies over the circle.
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  10. What happend as $D$ is moved outside the circle?
    MATH

  11. Construct the parabola as an envelope of straight lines.
    MATH

  12. Show that the feet of perpendicular from any point on the circumcircle of a triangle upon the sides of the triangle lie on a straight line. This line is called the Simson line. It is also called the Wallace line. Find the locus of all possible Simson lines to a fixed triangle.
    MATH

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