بِسْـــمِ اللَّهِ الرَّحْمَــنِ الرَّحِيْمِ

Diketahui:

• a = 12 cm
• t = 5 cm
• m = 13 cm
• Tp = 20 cm

Ditanyakan:

• K = ... cm?
• Lp = .... cm²?
• V = .... cm³?

Penyelesaian:

• Keliling

K = (2 × Ka) + jumlah seluruh sisi tegak

K = (2 × (a + t + m)) + (3 × Tp)

K = (2 × (12 + 5 + 13)) + (3 × 20)

K = (2 × 30) + 60

K = 60 + 60

K = 120 cm

• Luas permukaan

Lp = (2 × La) + (Ka × Tp)

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

Lp = (2 × ½ × 12 × 5) + ((13 + 12 + 5) × 20)

Lp = (12 × 5) + (30 × 20)

Lp = 60 + 600

Lp = 660 cm²

• Volume

V = La × Tp

V = ½ × a × t × Tp

V = ½ × 12 × 5 × 20

V = 6 × 5 × 20

V = 30 × 20

V = 600 cm³

وَاللَّهُ عَالَمُ بِاالصَّوَافَ

-S-