Question

66. The outer dimension of a metal box with lid is 12 cm, 10 cm and 8 cm. If the whole inside surface area
of it is 376 sqcm, then find the thickness of the metal sheet by which it is made.

Answer 1

Step-by-step explanation:

Internal length = (12 - 2) cm = 10 cm

Internal breadth = (10 - 2) cm = 8 cm

Internal height = (8 - 2) cm = 6 cm

Inner surface area :

= 2 [10 × 8 + 8 × 6 + 10 × 6] cm²

= (2 × 188) cm²

= 376 cm²

Answer 2

ANSWER ⏩

Internal length = (12-2)cm = 10cm

Internal breadth = (10-2)cm = 8cm

Internal height = (8-2)cm = 6cm

Inner surface area

= 2[10×8+8×6+10×6]

= (2×188) cm²

= 376cm²

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