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2r-r = 3+1
r = 4
sisi = 4+3 = 7 cm
keliling = 4 x sisi
= 4 x 7
= 28 cm
luas = sisi x sisi
= 7 x 7
= 49 cm²
2r-r = 3+1
r= 4
sisi = 4+ 3
keliling = 4x sisi
= 4x 7
= 28
luas= s.s
=7x7 = 49