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616=4xphixr²
phixr²=154
r²=154
r=√154
Lp tabung=2 x phi x r(r+t)=4 x phi x r²
L. alas tabung=2 x phi x r²=2 x phi x 154
=308
Lp. tabung=308+616=924
Tp ini galau bnr apa ngga nyaa ya
= 88/7 × r² = 616 cm²
= 616/88 × 7 = r²
= 7 × 7 = √49
r= 7 cm
Luas permukaan tabung = 2πr² + 2πrt
= (2 × 22/7 × 7 × 7) + (2 × 22/7 × 7 × 14) [t= r +r]
= 308 + 616
= 924