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d1= 16 cm
d2= 20 cm
L= d1*d2/2= 16*20/2= 160 cm^2
luas ketupat:
d1= 8 cm
d2= 16 cm
L= d1*d2/2= 8*16/2= 64 cm^2
Luas arsir= Luas layang - luas ketupat
Luas arsir= 160-64= 96 cm^2
jadi luas daerah diarsir adalah 96 cm^2