Pentax R-422VN, Инструкция по эксплуатации

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In circle A, an already-known circle, circle B, and circle
C are in a Parallel Arc with circle A.
When the input value is "+", Parallel Arc of circle A is
circle B.
When the input value is "-", Parallel Arc of circle A is
circle C.
Press [ACCEPT] to return to SOP->ARC screen.
7.3.2 Circle radius
Input center coordinate of the circle and radius to make a circle, then obtain the distance from
the Stake Out Point to the circumference.
Select 1.THREE POINT and press [ENT] to view
the STATION POINT SETUP screen.
Open the PN, X, Y, Z, IH and PC input window and
input each. Save the data by pressing [F1] [SAVE].
Stake Out Point : P
Station Point
RADIUS
CP
C
A
B