You can use the COMPASS tool to construct an EQUILATERAL TRIANGLE. Here's how:[br][br]1) Use the SEGMENT [icon]/images/ggb/toolbar/mode_segment.png[/icon] tool to construct a segment with endpoints [i]A[/i] and [i]B[/i]. [br]2) Select the COMPASS [icon]/images/ggb/toolbar/mode_compasses.png[/icon] tool. Then select point [i]A[/i], then select point [i]B[/i]. [br] (You should notice another circle appear. This circle has a radius = [i]AB[/i]). [br] Click on point [i]A[/i]. [br][br]3) Select the COMPASS tool again. This time, simply click on the segment [math]\overline{AB}[/math] itself. [br] Then click on point [i]B[/i]. [br][br]4) Use the INTERSECT [icon]/images/ggb/toolbar/mode_intersect.png[/icon] tool to plot the point(s) of intersection of the two circles you've just[br] constructed in steps (2) & (3). [br][br]5) Use the POLYGON [icon]/images/ggb/toolbar/mode_polygon.png[/icon] tool to construct the triangle formed by [i]A[/i], [i]B[/i], & the point you constructed in [br] step (4).

[color=#0000ff]When you're done (or if you're unsure of something), feel free to check by watching the quick silent screencast below. [/color]

Use the straightedge and compass tools to construct a square in the window below. Show all arc marks and darken your final answer.

Use the straightedge and compass tools to construct something else in window below. Show all arc marks and darken your final answer.