# HOW TO USE GEOGEBRA FOR ONLINE TEACHING | ANGLES | TRIANGLES | SLIDERS | RATIO | TIP FOR TEACHERS

TLDRThis tutorial demonstrates how to use GeoGebra for online teaching, focusing on creating angles with specific measurements and utilizing sliders. It covers the basics of drawing angles, adjusting properties like color and size, and adding arrows to lines. The video also explains how to construct triangles with given base lengths and angles, using GeoGebra's tools effectively. Additionally, it showcases the slider feature for dynamically adjusting angles, enhancing interactive learning experiences.

### Takeaways

- 😀 Start by opening a new file in GeoGebra to begin drawing angles.
- 📐 Use the angle tool to create angles of any measurement by clicking on the screen to mark points A, B, and C.
- 🛠️ Press 'Control Z' to undo actions like marking a point if needed.
- 📏 The tool automatically calculates and displays the angle measurement, like 106° for the example.
- 🎨 Customize the appearance of the angle by hiding unnecessary elements and adjusting style, color, and size.
- ➡️ Add arrows to line segments by adjusting the style settings of the segment.
- 🔒 Lock points using the move tool to control the movement of other points and maintain specific angles.
- 🔄 Create angles with a fixed measure by specifying the degree when drawing the angle.
- 📐 Draw triangles with given base lengths and base angles using the segment and angle tools.
- 🔄 Utilize sliders to dynamically adjust angles and explore different geometric configurations.
- 👨🏫 Sliders are beneficial for teachers to demonstrate variable angles and other geometric properties interactively.

### Q & A

### What is the main topic of the tutorial?

-The main topic of the tutorial is how to use GeoGebra for online teaching, specifically focusing on creating angles, triangles, using sliders, and understanding ratios.

### How does the tutorial start?

-The tutorial starts by opening a new GeoGebra file and introducing the angle tool.

### What are the different ways to create angles in GeoGebra as described in the tutorial?

-The tutorial describes creating angles by marking points on the screen, using the angle of any measurement tool, and using the angle with a given size tool.

### How can you hide the coordinates in GeoGebra?

-You can hide the coordinates by pressing Control+Z after marking a point.

### What is the purpose of using a slider in GeoGebra?

-A slider in GeoGebra is used to create variable angles and can be helpful for making different measurements of angles and straight lines.

### How can you format the appearance of an angle in GeoGebra?

-You can format the appearance of an angle by accessing the settings through the three dots menu, adjusting the style, line thickness, opacity, and line style.

### What is the process to draw a triangle with a given base and base angles in GeoGebra?

-To draw a triangle with a given base and base angles, you first draw the base segment, then create rays at each base endpoint with the specified angles, and finally find the intersection point of the rays to complete the triangle.

### How can you rename objects in GeoGebra?

-You can rename objects in GeoGebra by right-clicking on the object, selecting 'Rename', and then typing the new name.

### What does the tutorial suggest for evaluating angles with students?

-The tutorial suggests evaluating whether an angle is acute, reflex, or another type of angle after teaching and showing one object.

### How does the tutorial demonstrate the use of a slider to create a variable angle?

-The tutorial demonstrates using a slider to create a variable angle by setting the slider to control the angle measurement and then drawing an angle with a size that corresponds to the slider's value.

### What are the steps to hide points in GeoGebra?

-To hide points in GeoGebra, you go to the settings of the point, uncheck the 'Object' box, and save the changes.

### Outlines

### 📐 Introduction to Drawing Angles

The paragraph introduces a tutorial on how to draw angles with specific measurements using a tool. The instructor begins by opening a new file and discusses the use of the angle tool, which was previously introduced. The process involves marking a point on the screen, which is then used as the vertex of the angle. The instructor demonstrates how to draw an angle by joining points A, B, and C, and shows how the tool automatically calculates the angle measurement, in this case, 106°. The tutorial also covers how to format the angle, hide certain elements, and adjust the appearance, such as color and line style.

### 🔍 Customizing Angles and Using Arrows

This section of the tutorial focuses on customizing the appearance of angles and adding arrows to lines. The instructor shows how to adjust the size of the angle, decorate it with different styles, and add arrows to line segments. The process involves selecting the line segment, going to its settings, and choosing the style options such as line start and line end. The instructor also explains how to hide points on the angle and discusses the use of the move tool to resize the angle. The paragraph concludes with a discussion on how to use the angle tool for educational purposes, such as identifying the type of angle and its properties.

### 📏 Drawing Angles with Given Sizes

The third paragraph delves into drawing angles with a specific size. The instructor demonstrates how to use the tool to create an angle by marking a point and then specifying the angle measurement, such as 45°. The tool allows for the creation of an angle that maintains its specified measurement regardless of the size of the drawing. The paragraph also touches on how to create a triangle with given base lengths and base angles, using the text tool to input the measurements and the angle tool to draw the angles.

### 🛠️ Constructing a Triangle with Given Angles

In this paragraph, the focus is on constructing a triangle using the given base length and base angles. The instructor uses the segment tool to draw the base of the triangle and the angle tool to draw the base angles at points B and C. The process involves drawing rays from the base angles to find the third vertex of the triangle. The instructor also discusses renaming segments for clarity and demonstrates how to use the intersection tool to find the exact point where the rays intersect, completing the triangle.

### 🔄 Using Sliders for Variable Angles

The final paragraph introduces the use of sliders for creating variable angles. The instructor explains that sliders are a versatile tool that can be used to dynamically adjust angles and straight lines. The tutorial shows how to set up a slider with an interval and increment, and how to link the slider to an angle's measurement. By adjusting the slider, the angle measurement changes accordingly, allowing for the creation of angles with varying measurements. The instructor demonstrates how to use the slider tool to create an angle with a variable measurement linked to the slider, and shows how to format the angle to display only its value.

### Mindmap

### Keywords

### 💡GeoGebra

### 💡Angles

### 💡Sliders

### 💡Triangles

### 💡Ratio

### 💡Tip for Teachers

### 💡Graph Paper

### 💡Axis

### 💡Point

### 💡Line Segment

### 💡Formatting

### Highlights

Introduction to using GeoGebra for online teaching of angles and triangles.

Tutorial on creating angles with specific measurements using GeoGebra.

Explanation of using sliders to create angles.

Details on using angle tools in GeoGebra.

Step-by-step guide on drawing angles by marking points.

How to hide or show coordinates on the graphics screen.

Instructions on clearing the graphics screen for a new drawing.

Process of joining points to form an angle and displaying its measurement.

Formatting angles by hiding specific elements like point labels.

Customizing the appearance of angles, including color and line style.

Adding arrows to line segments to indicate direction.

Fixing points to control the movement of angles.

Using the move tool to adjust the size of angles.

Demonstration of creating an angle with a given size.

Explanation of how angles maintain their measurement when moved.

Tutorial on drawing a triangle with a given base and base angles.

Use of text tool to label measurements and angles in GeoGebra.

Creating a triangle using the segment of given length tool.

Using sliders to create variable angles for dynamic teaching.

Setting up a slider for angles with specific increments.

Creating an angle with a variable size using a slider.

Real-time angle measurement changes with the slider.

Conclusion and call to action for viewers to subscribe and share the tutorial.