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Penjelasan dengan langkah-langkah:
Bangun Ruang
1) LP
= 2πr² + 2πrt
= 2πr(r+t)
= 2×22/7×7(7+28)
= 44(35)
= 1540 cm²
2) LP
= 2πr² + 2πrt
= 2πr(r+t)
= 2×3,14×30(30+60)
= 188,4(90)
= 1884(9)
= 16956 cm²
3) LP
= 2πr(r+t)
= 2×3,14×10(10+30)
= 62,8(40)
= 2512 cm²
4) LP
diameter = 14 → r = 7
= 2πr(r+t)
= 2×22/7×7(7+18)
= 44(25)
= 1100 cm²
5) LP
= 2la + ls
= 2πr² + 2πrt
= (2×3,14×10×10)+1256
= 628 + 1256
= 1884 cm²