Garis berat dari bidang empat |

A
S

|




|

S

S

B
C
D



|




=




|

B
S

|




|

S

S

A
C
D



|




=




|

C
S

|




|

S

S

A
B
D



|




=




|

D
S

|




|

S

S

A
B
C



|




=


3
1




{\displaystyle {\frac {|AS|}{|SS_{BCD}|}}={\frac {|BS|}{|SS_{ACD}|}}={\frac {|CS|}{|SS_{ABD}|}}={\frac {|DS|}{|SS_{ABC}|}}={\frac {3}{1}}}