EXERCISE 12.3
( Take A = unless otherwise stated)
Find the volume and total surface area of a cuboid of edges
(1) 40 cm, 36 cm and 25 cm
(ii) 12 m, 8 m and 7 m
(ii) 20 m, 16 m and 15 m
(iv)/18 cm. 12 cm and 17 cm
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Answer:
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Answer:
i) 40cm,36cm,25cm
Total surface area of cuboid = 2(lb+bh+lh)
= 2(40*36+36*25+40*25)
=2(14400+900+1000)
=2*16300
= 32600cm²
Volume of cuboid = lxbxh
=40x36x25=3600cm³
ii)12m, 8m,7m
TSA=2(12x8+8x7+12x7)
=2(96 + 56 + 84)
=2(236)
=472cm²
Volume = lxbxh
=12x 8x 7
= 672cm³
III) 20m,16m,15m
TSA = 2(20x16 + 16x15 + 15x20)
=2(320 + 240 + 300)
=2(860)
=1720cm²
Volume = lxbxh
=20 x 16 x 15
=4800cm³
iv) 18cm,12cm,17cm
TSA= 2(18x12 + 12x17 + 18x17)
=2(216 + 204 + 306)
=2(726)
=1452cm²
Volume = lxbxh
=18x12x17
=3672cm³
Hope this helps you to understand easier...
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