Diketahui luas permukaan tabung 2.992 dm jka jari jari alasnya 14 dm tingginyanya??

L = 2x phi x r² + 2x phi x r x t
2992 = 2 x 22/7 x 14 x14 +2 x 22/7 x 14 x t
2992 = 44/7 x 196 + 44/7 x 14t
2992 = 1232 + 44/7 x 14t (7 sama 14 dicoret)
2992= 1232 + 44 x 2t
2992 - 1232 = 44 x 2t
1760 = 44 x 2t
1760/44 = 2t
40 = 2t
40/2 = t
20 =t
t = 20 dm

tolong dicek lagi ya