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Polar coordinates are entered using R∠Angle, where ∠ is Shift-x (multiply). Rectangular coordinates are entered using complex values as in a+b*i (where i is Shift-2). Also useful is the π symbol (shift-3).
In the geometry app you can enter a point in either form using the point() function.
If you enter a polar coordinate as in 1∠(π/4), and hit enter, and then hit the ∠ button again, it'll convert the number to it's rectangular/complex form.
The following function is a useful one to have in your arsenal. It will convert from polar to rectangular and vice versa…automatically.
EXPORT POLREC(Z) // POLAR/RECT CONVERT BEGIN LOCAL T,A,B; T:=STRING(Z); IF INSTRING(T,"∠") THEN // POLAR A:=RE(Z); B:=IM(Z); RETURN EXPR(A "+" B*i); ELSE // RECTANGULAR A:=ABS(Z); B:=ARG(Z); RETURN EXPR(A "∠" B); END // IF... END // BEGIN