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2464cm² = 4 x 22/7 x r²
2464 : 4 = 22/7 x r²
616 = 22/7 x r²
616 x 7/22 = r²
196 = r²
√196 = r
r = 14
luas selimut = 2π r t
luas selimut = 2 x 22/7 x 14x 5
luas selimut = 440
b
luas permukaan = 2π x r² + 2π x r x t
luas permukaan = 2 22/7 14² + 2 22/7 x 14 x 5
luas permukaan = 1672
c
volum tabung = luas alas x tinggi = π r² x t= 22/7 14² x 5 = 3080
no2
luas permukaan= 4 π r²
2464 = 4 x 22/7 r²
r² = 196
r = 14 cm