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Interactive geometry to use now |
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A macro is a shortcut for a
sequence of construction steps, just like subroutines of programming languages.
Macros have parameters, which determine the objects to start from, which
you select by clicking. They also have targets, which are the things to
construct. Click on the Run Macro button
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| Help with buttons |
Can you find ways of using these macros to make these constructions, in the minimum number of steps: |
| Start with | End up with | in... |
| A triangle | its circumcentre | 3 steps |
| A triangle | its incentre | 3 steps |
| A triangle | its centre of gravity | 5 steps |
| A line AB | a line perpendicular to AB and passing through A | 3 steps |
| A line AB and a point C not on AB | a line perpendicular to AB and passing through C | 3 steps |
| A line AB | the four sides and vertices of a square with AB as base | 9 steps |
below
and experiment with the three macros available.