1. Construct the perpendicular bisector of a line segment. Or, construct the midpoint of a line segment. 1. Begin with line segment XY.
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1 1. onstruct the perpendicular bisector of a line segment. Or, construct the midpoint of a line segment. 1. egin with line segment. 2. lace the compass at point. djust the compass radius so that it is more than (½). raw two arcs as shown here. 3. Without changing the compass radius, place the compass on point. raw two arcs intersecting the previously drawn arcs. Label the intersection points and. 4. Using the straightedge, draw line. Label the intersection point. oint is the midpoint of line segment, and line is perpendicular to line segment.
2 2. Given point on line, construct a line through, perpendicular to. 1. egin with line, containing point. 2. lace the compass on point. Using an arbitrary radius, draw arcs intersecting line at two points. Label the intersection points and. 3. lace the compass at point. djust the compass radius so that it is more than (½). raw an arc as shown here. 4. Without changing the compass radius, place the compass on point. raw an arc intersecting the previously drawn arc. Label the intersection point. 5. Use the straightedge to draw line. Line is perpendicular to line.
3 3. Given point, not on line, construct a line through, perpendicular to. 1. egin with point line and point, not on the line. 2. lace the compass on point. Using an arbitrary radius, draw arcs intersecting line at two points. Label the intersection points and. 3. lace the compass at point. djust the compass radius so that it is more than (½). raw an arc as shown here. 4. Without changing the compass radius, place the compass on point. raw an arc intersecting the previously drawn arc. Label the intersection point. 5. Use the straightedge to draw line. Line is perpendicular to line.
4 4. onstruct the bisector of an angle. 1. Let point be the vertex of the angle. lace the compass on point and draw an arc across both sides of the angle. Label the intersection points and. 2. lace the compass on point and draw an arc across the interior of the angle. 3. Without changing the radius of the compass, place it on point and draw an arc intersecting the one drawn in the previous step. Label the intersection point W. W 4. Using the straightedge, draw ray W. This is the bisector of. W
5 5. onstruct an angle congruent to a given angle. 1. To draw an angle congruent to, begin by drawing a ray with endpoint. 2. lace the compass on point and draw an arc across both sides of the angle. Without changing the compass radius, place the compass on point and draw a long arc crossing the ray. Label the three intersection points as shown. E 3. Set the compass so that its radius is. lace the compass on point E and draw an arc intersecting the one drawn in the previous step. Label the intersection point F. F E 4. Use the straightedge to draw ray F. EF F E
6 6. Given a line and a point, construct a line through the point, parallel to the given line. 1. egin with point and line. 2. raw an arbitrary line through point, intersecting line. all the intersection point. Now the tas is to construct an angle with vertex, congruent to the angle of intersection. 3. enter the compass at point and draw an arc intersecting both lines. Without changing the radius of the compass, center it at point and draw another arc. 4. Set the compass radius to the distance between the two intersection points of the first arc. Now center the compass at the point where the second arc intersects line. ar the arc intersection point. 5. Line is parallel to line.
7 7. Given a line segment as one side, construct an equilateral triangle. This method may also be used to construct a 60 angle. 1. egin with line segment TU. T U 2. enter the compass at point T, and set the compass radius to TU. raw an arc as shown. T U 3. Keeping the same radius, center the compass at point U and draw another arc intersecting the first one. Let point V be the point of intersection. V T U 4. raw line segments TV and UV. Triangle TUV is an equilateral triangle, and each of its interior angles has a measure of 60. V T U
8 8. ivide a line segment into n congruent line segments. In this example, n = egin with line segment. It will be divided into five congruent line segments. 2. raw a ray from point. Use the compass to step off five uniformly spaced points along the ray. Label the last point. 3. raw an arc with the compass centered at point, with radius. raw a second arc with the compass centered at point, with radius. Label the intersection point. Note that is a parallelogram. 4. Use the compass to step off points along line segment, using the same radius that was used for the points along line segment. 5. Use the straightedge to connect the corresponding points. These line segments will be parallel. They cut line segments and into congruent segments. Therefore, they must also cut line segment into congruent segments.
9 9. Given a circle, its center point, and a point on the exterior of the circle, construct a line through the exterior point, tangent to the circle. 1. egin with a circle centered on point. oint is on the exterior of the circle. 2. raw line segment, and construct point, the midpoint of line segment. (For the construction of the midpoint, refer to the perpendicular bisector construction, on page 1.) 3. enter the compass on point. raw a circle through points and. It will intersect the other circle at two points, and S. S 4. oints and S are the tangent points. Lines and S are tangent to the circle centered on point. S
10 10. onstruct the center point of a given circle. 1. egin with a circle, but no center point. 2. raw chord. 3. onstruct the perpendicular bisector of chord. Let and be the points where it intersects the circle. (efer to the construction of a perpendicular bisector, on page 1.) 4. hord is a diameter of the circle. onstruct point, the midpoint of diameter. oint is the center point of the circle. (efer to the construction of the midpoint of a line segment, on page 1.)
11 11. Given three noncollinear points, construct the circle that includes all three points. 1. egin with points,, and. 2. raw line segments and. 3. onstruct the perpendicular bisectors of line segments and. (efer to the perpendicular bisector construction, on page 1.) Let point be the intersection of the perpendicular bisectors. 4. enter the compass on point, and draw the circle through points,, and. 12. Given a triangle, circumscribe a circle. 1. egin with triangle STU. S T U 2. If a circle is circumscribed around the triangle, then all three vertices will be points on the circle, so follow the instructions above, for construction of a circle through three given points. S T U
12 13. Given a triangle, inscribe a circle. 1. egin with triangle KL. L K 2. onstruct the bisectors of K and L. (efer to the angle bisector construction, on page 4.) Let point be the intersection of the two angle bisectors. L K 3. onstruct a line through point, perpendicular to line segment KL. Let point be the point of intersection. (efer to the construction of a perpendicular line through a given point, on page 3.) K L 4. enter the compass on point, and draw a circle through point. The circle will be tangent to all three sides of a triangle. L K constructions courtesy of
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