Question

If the perimeter of one of the faces of a cube is 40 cm, then its lateral surface area is: *

(a) 400 sq.cm

(b) 600 sq.cm

(c) 1000 sq.cm

(d) 10 sq.cm

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Answer 1

Step-by-step explanation:

4a=40

a=10cm

Lateral surface area=4a²

=4×(10)²=400 sq cm

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Answer 2

Answer:

1000 sq.cm

Step-by-step explanation:

• The side of the one face of cube =40 cm=4a
• a=  40cm/4
• =10 cm​
• ∴  Volume =1000^3 cm  
• =a×a×a
• =10×10×10
• =1000^3 cm