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sisi = keliling / 4
sisi = 7
sisi = 10 - z
7 = 10 - z
z = 10 - 7
z = 3
S=10-z
Dit:z=?
Jwb
K=sx4
28=10-z.4
28/4=10-z
7=10-z
z=10-7
z=3
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