Focus......Use a variety of methods to construct perpendicular bisectors of Line segments
Bisect means to cut in half. When you bisect a line....you cut it in half.
If you construct the bisector at right angles (90 degrees) to the line segment.....you've constructed a Perpendicular Bisector.
There are several ways to construct perpendicular bisectors:
a) Use paper folding.
b) Use a compass.
c) Use a mira.
d) Use a ruler.
Method 1 - Paper Folding
1. Draw a line segment AB (about 10cm)
2. Fold the line in half so that Point B
is on top of point A.
3. Draw a line down the crease in your paper. This is your perpendicular bisector.
Method #2 - Mira
1. Draw a line segment AB (10cm)
2. Place the mira in the middle of the line segment, the reflection of Point A should be on top of Point B (otherwise your line won't be straight).
3. Draw a line down the mira
Method #3 - Use a Compass...
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgOjKuNOOnR_kfuxETn98XSENcUwP1YyJk5jxAbsqnHPLK8JKhlPzRH5nVw6lsxnocZs_mLiPFcMIodTJBGbYY5UtoX7sRHuK2VwR7Ta9v_jRDd1XtifuQIFM2lH2gkB54D89UFCcEF8Ao/s200/8.3d.png)
Method #4 - Ruler
1.) Draw a line segment AB (10 cm)
2.) Place the ruler on a diagonal
so that A is on one side of the ruler and
B is on the other side.
3.) Draw a line segment down each side of the ruler.
4.) Turn the ruler so that A and B are on opposite sides of the ruler and draw line segments again.
5.) Label the points where the line segments meet,
Point "C" and Point "D".
6.) Connect C and D to create a new line segment. CD is perpendicular to AB.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGxXjW9ASRxr2OMsguGP-YmR0T_xlYFt9oHV47eQ3-v4p_wcYfX0eTfUuygOfkL8cOImF9IIFV4h7gnxMuOut3FoWxAe0Rbv2o-6kydUdbqrQEcBtGgl1pqkF7HjEpF-ozDb493LBCnGc/s200/8.3f.png)
Homework:
pg. 308-309
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