Preparations Open a new GeoGebra window. Switch to Perspectives Algebra & Graphics. Construction Steps 1 Create point A. A = (0,0) Hint: The parentheses are closed automatically. 2 Create point B. (3,0) Hint: If you specify a name objects are named in don’t alphabetical order. 3 Construct a circle c with center A through point B Circle[A,B] Hint: This circle is a dependent object. Note: GeoGebra distinguishes between free and dependent objects. While free objects can be directly modified either using the mouse or the keyboard, dependent objects adapt to changes of their parent objects. Thereby, it is irrelevant in which way (mouse or keyboard) an object was initially created! Task 1 Activate Move mode and double-click an object in the Algebra View in order to change its algebraic representation using the keyboard. Hit the Enter key once you are done. Task 2 Use the arrow keys in order to move free objects in a more controlled way. Activate Move mode and select an object (e.g. a free point) in either window. Press the up / or left / right arrow keys in order to move the object into the desired direction. 4 Create point C. C = (5, 4) 5 Create segment AC. s = Segment[A, C] 6 Create midpoint D of segment AC. D = Midpoint[s]
Preparations Open a new GeoGebra window. Switch to Perspectives Algebra & Graphics. Construction Steps 1 A = (0,0) Create point A. Hint: The parentheses are closed automatically. 2 (3,0) Create point B. Hint: If you don’t specify a name objects are named in alphabetical order. 3 Circle[A,B] Construct a circle c with center A through point B Hint: This circle is a dependent object. Note: GeoGebra distinguishes between free and dependent objects. While free objects can be directly modified either using the mouse or the keyboard, dependent objects adapt to changes of their parent objects. Thereby, it is irrelevant in which way (mouse or keyboard) an object was initially created! Task 1 Activate Move mode and double-click an object in the Algebra View in order to change its algebraic representation using the keyboard. Hit the Enter key once you are done. Task 2 Use the arrow keys in order to move free objects in a more controlled way. Activate Move mode and select an object (e.g. a free point) in either window. Press the up / or left / right arrow keys in order to move the object into the desired direction. 4 C = (5, 4) Create point C. 5 s = Segment[A, C] Create segment AC. 6 D = Midpoint[s] Create midpoint D of segment AC.
ggb-intro-en44-2014-07-17.docx