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Verified answer
Diketahui:diameter= 14 cm
tinggi tabung= 20 cm
tinggi kerucut= 12 cm
π= 22/7
ditanya: luas permukaan....?
jawab:
luas sisi tabung tanpa tutup= π×r(r+2t)
= 22/7×7 (7+2×20)
= 22 (7+40)
= 22×47
= 1034 cm²
s²= r²+t²
s²= 7²+12²
s²= 49+144
s²= 193
s= √193
s= 13,89 cm
luas selimut kerucut= π×r×s
= 22/7×7×13,89
= 305,58 cm²
luas seluruhnya= 1034+305,58
= 1339,58 cm²