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25.. luas = luas lingkaran(r=7)+ 2x(20)
= 22/7 x 7 x 7 +400 = 154 +400=554
26..luas = 3/4 luas lingkaran =3/4 x22/7 x21x21 =1039.5
27.. soalnya gak kelihatan
tapi volume kubus - rusukxrusukxrusuk =20x20x20=6000 cm3