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Step-by-Step Examples 16-7
1. Find the exact length of AB in centimetres.
2. Determine the equation of the line AB.
First method Type:
STORE((-1,3),A)
and press .
Accept the change to
Complex mode, if
necessary.
Note that pressing
returns the coordinates in
complex form: –1+3i.
Now type:
STORE((-3,-1),B)
and press .
The coordinates this time are represented as –3+–1·i.
The vector AB has coordinates B – A.
Type:
(B - A)
Press . The result is
.
Now apply the DROITE
command to determine the
equation of the line AB:
Complex
DROITE A
B
Pressing gives an
intermediate result.
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hp40g+.book Page 7 Friday, December 9, 2005 1:03 AM