Experiment with the following tools below. [br][br]Move: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_move.png[/icon][br][br]Point: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_point.png[/icon], Intersect: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_intersect.png[/icon], Midpoint or Center: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_midpoint.png[/icon][br][br]Line: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_join.png[/icon], Segment: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_segment.png[/icon], Ray: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_ray.png[/icon], Vector: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_vector.png[/icon][br][br]Polygon: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_polygon.png[/icon][br][br]Angle: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_angle.png[/icon], Distance or Length: [icon]https://www.geogebra.org/images/ggb/toolbar/mode_distance.png[/icon][br][br]

[b]a. [/b] Measure the length of segment [i]AB[/i]. Select the [i]Distance or Length[/i] tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_distance.png[/icon]. Then, select point followed by point [i]B.[/i] Alternatively, you can simply select the [i]Distance or Length[/i] tool and click on the line segment. Select the move tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_move.png[/icon] and drag points [i]A[/i] and or [i]B[/i]. Note how the measurement between those two points changes in real time. [br][br][b]b. [/b] Plot a midpoint on line segment [i]CD[/i]. Select the Midpoint or Center tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_midpoint.png[/icon], and select points [i]C[/i] and [i]D[/i]. Using the [i]Distance or Length[/i] tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_distance.png[/icon], measure the distance between [i]C[/i] and the midpoint (should be point [i]E) [/i], and then measure the distance between [i]D[/i] and the midpoint.

[b]a. [/b] Measure angle ABC. Select the [i]Angle[/i] tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_angle.png[/icon]. Select point [i]A [/i]followed by point [i]B[/i] followed by point [i]C. [/i]Alternatively, select point [i]C[/i] followed by point [i]B[/i] followed by point [i]A. [/i]Note how the angle is adjacent to vertex [i]B[/i], and [i]B[/i] is always selected second because it is in between points [i]A[/i] and [i]C. [/i]Use the move tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_move.png[/icon] to select the angle measure and move so it is easier to see. [br][br][b]b.[/b] Measure all angles formed by line segments [i]QT[/i] and [i]SU[/i]. Using your knowledge of your work from above, measure all angles in the diagram below using the [i]Angle[/i] tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_angle.png[/icon]. Note how you will always select [i]R[/i] second. As an example, measure angle [i]QRS[/i] by selecting point [i]Q[/i] followed by point [i]R[/i] followed by point [i]S ([/i]or [i]S [/i]followed by [i]R[/i] followed by [i]Q[/i]).