Now we need to learn some of the same constructions we just did but with angles instead of lines, we will start with bisecting an angle; so cutting an angle in half.

This construction is not obvious but if you play around with the tools we have gained you can figure out a way to do it; there are actually multiple ways![br][br]See if you can come up with a path on your own and if you need help, watch the video.

In BC 3, we learned a new feature that we gained a tool for! We learned how to draw a perpendicular through a point so we gained the [icon]/images/ggb/toolbar/mode_orthogonal.png[/icon] tool. Use the applet below to draw a perpendicular to AB through point C. Use the [icon]/images/ggb/toolbar/mode_orthogonal.png[/icon], click on the line, a then click point C.[br][br]Get comfortable with this tool.