Title: 3. Angle, Slope, Distance
Course: Use : JKU > Section: Authomath Basic GeoGebra Course

In Introduction to GeoGebra, we learned to draw the figure below using the Point, Line Segment, and Midpoint tools. In this tutorial, we will use the Angle, Slope, and Distance or Length tools to verify your conjecture that EFGH is a parallelogram. Try them yourself first and if you have difficulties, read the Notes below.

Notes

- To use the Angle tool, click on it and then click three points or two line segments.
- To use the Slope tool, click on it and then click on a line segment.
- To use the Distance tool, click on it and then click on a line segment or two points.
- You will observe that sometimes, the angles become Reflex angles when you drag the points. If you want to set the angle from 0﻿° to 180﻿°, click on the Style bar (icon on the top right), then select the Angle symbol, and then choose 0﻿° to 180﻿°.
- You can also use the Style bar to change the properties of objects such as color and size.

Questions for Discussion

1. How did the tools above help you in verifying your conjecture that EFGH is a parallelogram?
2. Challenge: Prove your conjecture!