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S☆T☆R=4S+2T-3R
S=banyak sisi balok
T=banyak titik sudut balok
R=banyak rusuk balok
diperoleh:
S=6 ,T=8 ,R=12
jadi
S☆T☆R=4S+2T-3R
=4(6)+2(8)-3(12)
=24+16-36
=4