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b. 3,14x3,5x3,5x4 = 153,86
c. 3,14x20x20x4 = 5024
a. diameter = 10 jadi r = 5
= 4 x 3,14 x 5²
= 314 cm²
b. jari-jari 3,5 cm maka
= 4 x 22/7 x 3,5 x 3,5
= 154 cm²
c. jari-jarinya 20 cm maka
= 4 x 3,14 x 20²
= 5024 cm²
Jika jawaban cukup membantu .. boleh dong minta bintangnya ? :)