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Lp = 2 . 22/7 . 14 (14 + 20)
Lp = 88 (34)
Lp = 2992 cm²
Lpt = 2πr + πr²
Lpt = 2 . 22/7 . 14 + 22/7 . 14 . 14
Lpt = 88 + 528
Lpt = 616 cm²
Ls = 2πr
Ls = 2 . 22/7 / 14
Ls = 88 cm²
Luas tabung = (22/7 x 14 x 14) x 2 + luas selimut
Luas tabung = 1232 + (phi x d x 20)
Luas tabung = 1232 + (22/7 x 28 x 20)
= 1232 + 1760
= 2992 cm2
Luas satu tutup = 616 cm2
Luas tabung tanpa alas = 2992 - 616 = 2376 cm2
Luas selimut = 1760 cm2
Ini hasil hitungan spontan.. Tolong dicek lagi apakah hitungannya bener.. Makasii moga membantu..