Matematika hitunglah luas permukaan bangun ruang berikut!​

murlfriesenulv – March 30, 2023

hitunglah luas permukaan bangun ruang berikut!
​

Nomor 1:

Diketahui:

• s = 6 cm

Ditanyakan:

• Lp = ... cm²?

Penyelesaian:

Lp = 6s²

Lp = 6 × 6²

Lp = 6 × 36

Lp = 216 cm²

Nomor 2:

Diketahui:

• p = 28 cm
• l = 10 cm
• t = 15 cm

Ditanyakan:

• Lp = .... cm²?

Penyelesaian:

Lp = 2(pl + pt + lt)

Lp = 2(28 × 10 + 28 × 15 + 10 × 15)

Lp = 2(280 + 420 + 150)

Lp = 2(850)

Lp = 1.700 cm²

Nomor 3:

Diketahui:

• d = 10 cm
• r = 10/2 = 5 cm
• t = 17 cm
• π = 3,14

Ditanyakan:

• Lp = .... cm²?

Penyelesaian:

Lp = 2πr (r + t)

Lp = 2 × 3,14 × 5 (5 + 17)

Lp = 6,28 × 5 × 22

Lp = 31,4 × 22

Lp = 690,8

Lp = 691 cm²

Nomor 4:

Diketahui:

• a = 8 cm
• t = 9 cm
• m = 12 cm
• T = 28 cm

Ditanyakan:

• Lp = .... cm²?

Penyelesaian:

Lp = (2 × La) + (Ka × T)

Lp = (2 × ½ × a × t) + ((a + t + m) × T)

Lp = (2 × ½ × 8 × 9) + ((8 + 9 + 12) × 28)

Lp = (8 × 9) + (39 × 28)

Lp = 72 + 1.092

Lp = 1.164 cm²

[answer.2.content]