# GGebra Lessons

## Collection by Timo Mäkimarttunen

Cool geogebra applets for math lessons and teaching. Every applet has code for embedding, so you can copy applet very easily to your own board (for example moodle)...

## mathematics

### Triange inside of a circle

Triangle inside of a circle Draw perpendicular bisectors to each side of a triangle. This way you get intersect which is center point of a circle that seals in the original triangle.

### Clock: Analog vs. digital (v2)

Clock This time you have to move the clock pointers according to digital timestamp.

### Basic additions

Basic additions and substractions on number line. Starting with the basics. In this applet you will count additions or substractions with easy numbers between [-8,8]. The snail represents moving in the number line. Smooth animations help learning.

## Other Pins

### Area of a trapezoid

Area of a trapezoid This app demonstrates the area of a trapezoid. Move the sliders to proceed.

### Multiplication

Multiplication Test and learn multiplication with this small applet. You can set min and max for numbers tested.

### Parallelogram

Parallelogram Area of a parallelogram. Move the slider to see explanation.

### Triange inside of a circle

Triangle inside of a circle Draw perpendicular bisectors to each side of a triangle. This way you get intersect which is center point of a circle that seals in the original triangle.

### Angles of a triangle

Angles of a triangle One of the first things we learn about triangle geometry, is the sum of its angles, 180o. This app demonstrates why is it so. Move the slider(s) to see.

### Parabola

Parabola Parabola is graph of quadratic function and part of the conic sections family. In this applet you can adjust values for a, b and c in graph: y = ax2 + bx + c How many possible roots there are? How many interceptions with y-axis?

### Area of Triangle

Area of a triangle Area is calculated: 1/2 * base * height. In this applet area of a triangle is represented with blue color and it is area of a rectangle divided by 2.

### Central angle and inscribed angle

Central angle and inscribed angle of a circle Can you find out what is the relationship between central angle and inscribed angle of a circle.

### Pi

What is pi? Why is it approximately 3.14? This small applet demonstrates circumference of a circle with diameter 1.

### Function of degree 1

First degree function A function of degree one can be represented with a line. In this app you can change the gradient (k) and intercept (b) of function y = kx + b. See what happens.

### Small applets for simplifying expressions

Simplify algebraic Expression I created four different small apps for simplifying expressions. Every applet is a game, in which you collect points. Simplify expressions with brackets Two sets of brackets... Simplify multiplication of two monomes

### Fractions

How to show fractions? With this applet you can teach fractions easily.

### Multiply!

Multiply! In this game you have to multiply given numbers. You can choose between positive and negative numbers.

### Time between two clocks

Time between two clocks This is one more example of clocks. In this case you have to count time between two clocks. You can select the accuracy with purple slider (1min, 5min, 15min, 30min and even hours).

### Clock: Analog vs. digital (v2)

Clock This time you have to move the clock pointers according to digital timestamp.