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4 years ago

BRAINLIEST PLUS POINTS

Mathematics

1 answer:

Zanzabum4 years ago

4 0

Answer:

Step-by-step explanation:

a) Internal surface area:

height h = 300 mm = 3 cm =0.3 m

breadth b = 1000 -(300+300) = 1000 - 600 = 400 mm = 0.4 m

length l = 1200 - (300+300) = 1200 - 600 = 600 mm = 0.6 m

Internal surface Area = lb + 2hl + 2bh

= 0.6 * 0.4 + 2 * 0.3 * 0.6 + 2 * 0.4 * 0.3

= 0.24 + 0.36 + 0.24

= 0.84 sq.m

b) Volume

volume = lbh

= 0.6 * 0.4 * 0.3

= 0.072 cu. m

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