Circles
Central Angles, Arcs, and Chords
Step 1
Use the LINE tool 
to construct a line through Center A and Point B.
to construct a line through Center A and Point B.Step 2
Construct a Point C on the circle using the POINT tool 
.
.Step 3
Use the LINE tool to construct a line through Center A and Point C.
tool to construct a line through Center A and Point C. Step 4
Click the Point tool in the toolbar.
Then use the INTERSECTION
tool to construct Point D and Point E.
(Point D should intersect line AB and the circle. Point E should intersect line AC and the circle.)
tool to construct Point D and Point E.
(Point D should intersect line AB and the circle. Point E should intersect line AC and the circle.)
Step 5
Use the ANGLE MEASURE 
tool to create and measure angle BAC and angle DAE.
*First select the point B, then center A, then select point C counterclockwise!*
*First select the point D, then center A, then select point E counterclockwise!*
tool to create and measure angle BAC and angle DAE.
*First select the point B, then center A, then select point C counterclockwise!*
*First select the point D, then center A, then select point E counterclockwise!* Step 6
Use the CIRCULAR ARC 
tool to create and measure Arc BC and Arc DE.
*First select the center A, then select Points B and C counterclockwise!*
*First select the center A, then select Points D and E counterclockwise!*
tool to create and measure Arc BC and Arc DE.
*First select the center A, then select Points B and C counterclockwise!*
*First select the center A, then select Points D and E counterclockwise!*Step 7
Use the Algebra window to see the measures of Arc BC (labeled "d") and Arc DE (labeled "e").
Step 8
Use the SEGMENT 
tool to construct Chord "h" with endpoints B and C.
Use the SEGMENT tool to construct Chord "i" with endpoints D and E.
tool to construct Chord "h" with endpoints B and C.
Use the SEGMENT tool to construct Chord "i" with endpoints D and E.Step 9
Use the Algebra Window to see the measures of Chord h and Chord i.