Constructing Angle Bisectors with Compass and Straightedge

This video tutorial demonstrates how to bisect an angle using a compass and a straight edge. It begins by setting up the compass to create an arc that intersects both sides of the given angle. The intersection points are labeled as B and C. Next, arcs are drawn from these points to find the bisector point, labeled as D. Finally, a straight edge is used to draw the angle bisector through points A and D, completing the process.

What is the main purpose of the video?

• To show how to draw a circle

• To demonstrate how to bisect an angle using a compass and straight edge

• To teach how to measure angles

• To explain the properties of angles

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CCSS.HSG.CO.C.9

What is the first step in bisecting an angle?

• Label the intersection points

• Draw a straight line

• Place the compass point on the angle's vertex

• Measure the angle

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CCSS.4.G.A.1

After placing the compass point on the angle's vertex, what should you do next?

• Measure the angle

• Open the compass arm large enough to intersect both sides of the angle

• Label the intersection points

• Draw a straight line

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CCSS.HSG.CO.C.9

What should you label the intersection points of the arc with the angle sides?

• A and B

• B and C

• C and D

• D and E

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CCSS.HSG.CO.C.9

Where should you place the compass point after labeling the intersection points?

• On point C

• On point B

• On point A

• On the vertex of the angle

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CCSS.HSG.CO.C.9

What is the purpose of creating arcs from points B and C?

• To measure the angle

• To find the midpoint of the angle

• To find the intersection point of the arcs

• To draw a straight line

What is the final step in bisecting the angle?

• Label the intersection points

• Draw a straight line through the vertex and the intersection of the arcs

• Measure the angle

• Open the compass arm