3. Luas permukaan balok
Luas permukaan balok = 2 x (p x l + p x t + l x t)
Lp balok = 2 x (7 cm x 4 cm + 7 cm x 2 cm + 4 cm x 2 cm)
= 2 x (28 cm2
+ 14 cm2
+ 8 cm2
)
= 2 x 50 cm2
= 100 𝐜𝐦𝟐
4. Contoh soal:
Luas Permukaan Kubus = 6 x s x s
= 6 x 10 cm x 10 cm
= 6 x 100 cm2
= 600 𝐜𝐦𝟐
Luas Permukaan Kubus = 6 x s x s
= 6 x 25 cm x 25 cm
= 6 x 625 cm2
= 3.750 𝐜𝐦𝟐
5. Luas Permukaan Balok = 2 x (p x l + p x t + l x t)
= 2 x (10 cm x 5 cm + 10 cm x 4 cm + 5 cm x 4 cm)
= 2 x (50 cm2 + 40 cm2 + 20 cm2)
= 2 x 110 cm2
= 220 𝐜𝐦𝟐
6. Luas Permukaan Balok = 2 x (p x l + p x t + l x t)
= 2 x (12 cm x 6 cm + 12 cm x 8 cm + 6 cm x 8 cm)
= 2 x (72 cm2 + 96 cm2 + 48 cm2)
= 2 x 216 cm2
= 432 𝒄𝒎𝟐