MAKE GEOMETRIC CONSTRUCTIONS
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- Beverly Stewart
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1 MAKE GEOMETRIC CONSTRUCTIONS KEY IDEAS 1. To copy a segment, follow the steps given: Given: AB Construct: PQ congruent to AB 1. Use a straightedge to draw a line, l. 2. Choose a point on line l and label it point P. 3. Place the compass point on point A. 4. Adjust the compass width to the length of AB. 5. Without changing the compass, place the compass point on point P and draw an arc intersecting line l. Label the point of intersection as point Q. 6. PQ AB. 2. To copy an angle, follow the steps given: Given: Construct: ABC QRY congruent to ABC 1. Draw a point R that will be the vertex of the new angle. 2. From point R, use a straightedge to draw RY, which will become one side of the new angle. 47
2 3. Place the compass point on vertex B and draw an arc through point A. 4. Without changing the compass, place the compass point on point R, draw an arc intersecting RY, and label the point of intersection point S. 5. Place the compass point on point A and adjust its width to where the arc intersects BC. 6. Without changing the compass width, place the compass point on point S and draw another arc across the first arc. Label the point where both arcs intersect as point Q. 7. Use a straightedge to draw RQ. 8. QRY ABC 3. To bisect an angle, follow the steps given: Given: ABC Construct: BY, the bisector of ABC 1. Place the compass point on vertex B. 2. Open the compass and draw an arc that crosses both sides of the angle. 3. Set the compass width to more than half the distance from point B to where the arc crosses BA. Place the compass point where the arc crosses BA and draw an arc in the angle s interior. 4. Without changing the compass width, place the compass point where the arc crosses BC and draw an arc so that it crosses the previous arc. Label the intersection point Y. 5. Using a straightedge, draw a ray from vertex B through point Y. 48
3 6. ABY YBC, so BY is the bisector of ABC. 4. To construct a perpendicular bisector of a line segment, follow the steps given: Given: AB Construct: The perpendicular bisector of AB 1. Adjust the compass to a width greater than half the length of AB. 2. Place the compass on point A and draw an arc passing above AB and an arc passing below AB. 3. Without changing the compass width, place the compass on point B and draw an arc passing above and below AB. 4. Use a straightedge to draw a line through the points of intersection of these arcs. 5. The segment is the perpendicular bisector of AB. Note: To bisect AB, follow the same steps listed above to construct the perpendicular bisector. The point where the perpendicular bisector intersects AB is the midpoint of AB. 49
4 5. To construct a line perpendicular to a given line through a point not on the line, follow the steps given: Given: Line l and point P that is not on line l Construct: The line perpendicular to line l through point P 1. Place the compass point on point P. 2. Open the compass to a distance that is wide enough to draw two arcs across line l, one on each side of point P. Label these points Q and R. 3. From points Q and R, draw arcs on the opposite side of line l from point P so that the arcs intersect. Label the intersection point S. 4. Using a straightedge, draw PS. 5. PS QR. 6. To construct a line parallel to a given line through a point not on the line, follow the steps given: Given: Line l and point P that is not on line l Construct: The line parallel to line l through point P 50
5 1. Draw a transversal line through point P crossing line l at a point. Label the point of intersection Q. 2. Open the compass to a width about half the distance from points P to Q. Place the compass point on point Q and draw an arc that intersects both lines. Label the intersection of the arc and PQ as point M and the intersection of the arc and l as point N. 3. Without changing the compass width, place the compass point on point P and draw an arc that crosses PQ above point P. Note that this arc must have the same orientation as the arc drawn from points M to N. Label the point R. 51
6 4. Set the compass width to the distance from points M to N. 5. Place the compass point on point R and draw an arc that crosses the upper arc. Label the point of intersection S. 6. Using a straightedge, draw a line through points P and S. 7. PS l 52
7 7. To construct an equilateral triangle inscribed in a circle, follow the steps given: Given: Circle O Construct: Equilateral ABC inscribed in circle O 1. Mark a point anywhere on the circle and label it point P. 2. Open the compass to the radius of circle O. 3. Place the compass point on point P and draw an arc that intersects the circle at two points. Label the points A and B. 4. Using a straightedge, draw AB. 5. Open the compass to the length of AB. 6. Place the compass point on A. Draw an arc from point A that intersects the circle. Label this point C. 7. Using a straightedge, draw AC and BC. 8. Equilateral ABC is inscribed in circle O. 53
8 8. To construct a square inscribed in a circle, follow the steps given: Given: Circle O Construct: Square ABCD inscribed in circle O 1. Mark a point anywhere on the circle and label it point A. 2. Using a straightedge, draw a diameter from point A. Label the other endpoint of the diameter as point C. This is diameter AC. 3. Construct a perpendicular bisector to AC through the center of circle O. Label the points where it intersects the circle as point B and point D. 54
9 4. Using a straightedge, draw AB, BC, CD, and AD. 5. Square ABCD is inscribed in circle O. 9. To construct a regular hexagon inscribed in a circle, follow the steps given: Given: Circle O Construct: Regular hexagon ABCDEF inscribed in circle O 1. Mark a point anywhere on the circle and label it point A. 2. Open the compass to the radius of circle O. 3. Place the compass point on point A and draw an arc across the circle. Label this point B. 4. Without changing the width of the compass, place the compass point on B and draw another arc across the circle. Label this point C. 5. Repeat this process from point C to a point D, from point D to a point E, and from point E to a point F. 6. Use a straightedge to draw AB, BC, CD, DE, EF, and AF. 7. Regular hexagon ABCDEF is inscribed in circle O. 55
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