constructions. supplies paper (thick stack) compass straight edge
Post on 29-Dec-2015
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Constructions
Supplies
Paper (thick stack)CompassStraight Edge
Congruent Line SegmentDraw a straight lineOpen compass where the point is on A and the pencil is on BPlace point on new end pointMake small arc on line
A
B
A
B
Draw point on arcResult: Congruent Line Segment
•
Segment Bisector (_|_)Select compass size > ½ the line segmentPlace Point on A make large arcPlace Point on B make large arcLook for arc intersections
AB
Connect “X”s with Straight edgeResult: Perpendicular Bisector
A
B
Angle BisectorSet compassPlace point on vertexMake arc intersecting both sidesSet compass from intersection to intersectionMake small arc in the interior from each intersection
Draw a straight line from vertex through “X”Result: Angle bisector
Congruent Angles
Draw a lineMake arc on original angle (point on vertex)Make arc on new line
Point on end pointWith compass measure arc length from side to side
Draw line from new vertex through “X”Result: Congruent angles
How would you …
Double a line segment?Increase line segment by Half?
Make a 45 angle?A number line?Add two line segments together?Add two angles together?
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