112 Activities
1. Set the modes for Page 1 as shown in this
screen. (Show angles in degrees instead of
radians and display all digits with a floating
decimal point.)
Press: 3 D D D. On the Angle option,
select
2:DEGREE. On the Display Digits
option, select E:FLOAT.
2. Enter vectors describing the initial path of
the boat, water current, and resultant path
of the boat.
Store these vectors as i, c, and r. Use the
value
a for the unknown speed of the
current. Use the value
b for the speed of the
boat.
Enter:
[20,80¡]!i
[a,0
¡]!c
[b,60°]
!r
Vectors are commonly written in either polar or
rectangular form, so it is useful to convert polar
vectors into rectangular form.
3. Define function
p2r.
Enter: Define p2r(x)=[x[1,1]*cos(x[1,2]),
x[1,1]*sin(x[1,2])]
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