**1. Explain any two parts of the GeoGebra screen.**

Ans. The main parts of the GeoGebra
screen are :

**a) Algebra View**: This part of the GeoGebra screen lists the algebraic representations of all the mathematical objects created.

**b) Graphic View**: It is the main work area in which geometric objects are constructed or displayed.

**c) Input bar**: It contains a text box in which algebraic inputs - e.g. values, coordinates, equation, etc. as well as commands can be typed. there is also a drop down list boxu of all the GeoGebra commands.

**2. Give two methods in GeoGebra to find mean, median and mode of a given list.**

Ans. To find mean, median and mode
of a list of sample date, the list may be created in two ways in GeoGebra,
namely using the input bar of the Spreadsheet View.

Method 1 : In the input field of the
Input bar, type the sample data as a comma delimited list within braces

Method 2 : Enable the Spreadsheet
View from the View menu. Enter the data in the first column or row. Select all
the data by dragging the mouse, and select Create List from the right-click
context menu.

Suppose a list has been created with
a name L

_{1}. To find the mean, median and mod of the list, type each command with the list name enclosed within square brackets in the Input bar.
Mean[L

_{1}]
Median[L

_{1}]
Mode[L

_{1}]
and press enter key. The Algebra
view displays the values under dependent objects.

**3. Give the uses of the following tools in GeoGebra.**