How make formula of distance

insert->dimension->Keyin

then copy and paste fomula as MEAS value

CIRCLE1 =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,OUT,LEAST_SQR
THEO/<0,0,0>,<0,0,1>,20,0
ACTL/<0,0,0>,<0,0,1>,20,0
TARG/<0,0,0>,<0,0,1>
START ANG=0,END ANG=0
ANGLE VEC=<1,0,0>
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=7,DEPTH=5,PITCH=0
SAMPLE METHOD=SAMPLE_HITS
SAMPLE HITS=0,SPACER=0
AVOIDANCE MOVE=BOTH,DISTANCE=10
FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
SHOW HITS=NO
CIRCLE2 =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,OUT,LEAST_SQR
THEO/<10,0,0>,<0,0,1>,23,0
ACTL/<10,0,0>,<0,0,1>,23,0
TARG/<10,0,0>,<0,0,1>
START ANG=0,END ANG=0
ANGLE VEC=<1,0,0>
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=7,DEPTH=5,PITCH=0
SAMPLE METHOD=SAMPLE_HITS
SAMPLE HITS=0,SPACER=0
AVOIDANCE MOVE=BOTH,DISTANCE=10
FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
SHOW HITS=NO
DIM LOC1= KEYED IN DIMENSION OUTPUT=BOTH
AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
M 8.500 0.010 -0.010 ABS((DIST3D({CIRCLE1},{CIRCLE2}) + CIRCLE1.RADIUS) - CIRCLE2.RADIUS) 0.000

insert->dimension->Keyin

then copy and paste fomula as MEAS value

CIRCLE1 =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,OUT,LEAST_SQR
THEO/<0,0,0>,<0,0,1>,20,0
ACTL/<0,0,0>,<0,0,1>,20,0
TARG/<0,0,0>,<0,0,1>
START ANG=0,END ANG=0
ANGLE VEC=<1,0,0>
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=7,DEPTH=5,PITCH=0
SAMPLE METHOD=SAMPLE_HITS
SAMPLE HITS=0,SPACER=0
AVOIDANCE MOVE=BOTH,DISTANCE=10
FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
SHOW HITS=NO
CIRCLE2 =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,OUT,LEAST_SQR
THEO/<10,0,0>,<0,0,1>,23,0
ACTL/<10,0,0>,<0,0,1>,23,0
TARG/<10,0,0>,<0,0,1>
START ANG=0,END ANG=0
ANGLE VEC=<1,0,0>
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=7,DEPTH=5,PITCH=0
SAMPLE METHOD=SAMPLE_HITS
SAMPLE HITS=0,SPACER=0
AVOIDANCE MOVE=BOTH,DISTANCE=10
FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
SHOW HITS=NO
DIM LOC1= KEYED IN DIMENSION OUTPUT=BOTH
AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
M 8.500 0.010 -0.010 ABS((DIST3D({CIRCLE1},{CIRCLE2}) + CIRCLE1.RADIUS) - CIRCLE2.RADIUS) 0.000

A warning, if these circles are placed on different heights you will get a longer distance as you are using DIST3D.

Thank you for support,
I got it.!