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Acc Math 1 Feb 15 th. What you need today in class: Turn in homework pp. 26 Get a compass and protractor Those who did not complete yesterday’s activity need to get their materials and complete it quickly!. WARM-UP: #1 Copy the diagram and label the measure of each angle (all 8). - PowerPoint PPT Presentation
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Acc Math 1 Feb 15th
What you need today in class: Turn in homework pp. 26Get a compass and protractor
Those who did not complete yesterday’s activity need to get their materials and complete it quickly!
WARM-UP:
#1 Copy the diagram and label the measure of each angle (all 8)
133o
Check Homework p. 26
1. G
2. W3. U
4. ASA5. SSS6. NOT POSSIBLE7. ASA OR AAS8. ASA9. NOT POSSIBLE10.SSS11.ASA12.SAS13.AAS
Special Lines in TrianglesName of Line Definition Picture or Construction
Angle Bisector
Perpendicular Segment Bisector
Altitude
Median
Special Lines in TrianglesName of Line Definition Picture or Construction
Angle Bisector Cuts an angle into two congruent angles
Perpendicular Segment Bisector
Altitude
Median
Special Lines in TrianglesName of Line Definition Picture or Construction
Angle Bisector Cuts an angle into two congruent angles
Perpendicular Segment Bisector
Cuts a segment into two congruent segments at a
90o angle
Altitude
Median
Special Lines in TrianglesName of Line Definition Picture or Construction
Angle Bisector Cuts an angle into two congruent angles
Perpendicular Segment Bisector
Cuts a segment into two congruent segments at a
90o angle
AltitudeHeight of a triangle;
Perpendicular from base to vertex
Median
Special Lines in TrianglesName of Line Definition Picture or Construction
Angle Bisector Cuts an angle into two congruent angles
Perpendicular Segment Bisector
Cuts a segment into two congruent segments at a
90o angle
AltitudeHeight of a triangle;
Segment drawn perpendicular from base to
vertex
MedianA segment from the
midpoint of a side to the opposite vertex
Place the compass on the point where one arc crosses a leg and draw an arc in the interior of the angle.
Place the compass on one end of the line segment.
Set the compass width to approximately two thirds the line length. Actual width does not mater
Hold the compass in place and without changing the width , draw an arc above and below the line. (You can also draw it through the line)
Without changing the compass width, move the compass point to the other endpoint of the segment. Draw another arc above and below the line so that the arcs cross the first ones.
Set the compass width to approximately 50% more than the distance to the line. The exact width does not matter.
Draw an arc across the line on each side of “R”, making sure not to adjust the compass width in between.
At this point, you can adjust the compass width. From each point where the arcs intersect the segment, draw and arc below the line so that the arcs cross. Keep the width the same when drawing both of these arcs.