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Lp = 2 x π x r²
= 2 x 22/7 x 70 x 70
= 44 x 10 x 70
= 30.800 cm³
jawabannya C
= 2 x 22/7 x 4900
= 30.800 dm²
jadi luas permukaan atap = c. 30.800 dm²
maaf kalo salah