MA.912.GR.5.1/5.2/5.3

What tool is NOT used in pure geometric constructions?

• Compass

• Protractor

• Straightedge

• Pencil

Click on "Line Segment Bisector, Right Angle". Watch the animation and then put the steps in order.

• • Draw arcs above and below the line.

• • Adjust the compass to slightly longer than half the line segment length.

• • Place the compass at one end of line segment.

• • Place ruler where the arcs cross, and draw the line segment.

• • Keeping the same compass width, draw arcs from other end of line.

Click on "Angle Bisector" and watch the animation.

After you draw the first arc, what should you do next?

• Without changing the compass width, place the compass point on the intersection of the arc and the angle.

• Draw an arc inside the angle.

• Draw another arc inside the angle, ensuring it intersects the previous arc from inside the angle.

• Using your straightedge, connect the vertex of the angle with the intersection point of the two arcs.

Click on "Copy a Line Segment" and watch the animation. Reorder the steps below into the correct order.

• Set the compasses' point on the point of the line segment to be copied and adjust the compasses' width to the point

• Keeping the same width, place the point of the compass on the new point drawn in Step 1.

• Connect the point from Step 1 to the arc by tracing along a straightedge.

• Using the pencil, lightly draw an arc.

• Draw a point that will be one endpoint of the new line segment.

Scroll down to "Angles" and click on "Same Angle Construction." After you draw an arc using the same setting on both vertex points, what should you do next?

• Transfer the measured distance to the new arc. Using the compass, place the point at the intersection of the arc with the line segment.

• Draw an arc intersecting the previous arc. 

• Measure the distance between the intersections of the arc with the original angle's rays

• Draw a line from the vertex to the intersection of the two arcs.

What is the first step in drawing a line perpendicular to a point on the line? (hint: find this animation on the website and watch)

• Make an arc on both sides of the point on the line, using the same width on the compass.

• Place compass point on the intersection of the arc and line, stretch the compass to just over half way.

• Repeat on both sides, marking an arc above the line and below the line.

• Using the straightedge, connect the two points where the arcs above and below the line intersect.

When bisecting an angle, where should you first place the point of your compass?

Jenny used a compass and a straight edge to make this construction.   What is she most likely doing? ​ ​ (a)  

• constructing the perpendicular bisector to PQ
• constructing a parallel line to PQ.
• copying line segment PQ.
• constructing an angle bisector.

Select the correct answer.

• A

• B

• C

• D

When copying line segment AB using a straight edge and a compass, the compass should be used to:

• Draw an arc above point A

• 
  Draw an arc between point A and point B

• Measure the length of segment AB

• 
  Measure half the length of line segment AB