:::

,

:::

4' x 8' = mm. x 23.33

3 mm. x 4' x 8' = 3 x 23.33 = 70 kg.

0.9 mm. x 4' x 8' = 0.9 x 23.33 = 21 kg.

5' x 10' = mm. x 36.5

6 mm. x 5' x 10' = 6 x 36.5 = 219 kg.

20 mm. x 5' x 10' = 20 x 36.5 = 230 kg.

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:::

= mm. x cm. x cm. x 0.000785

12 mm. = 12 x 23 x 38 x 0.000785 = 82 kg.

18 mm. = 18 x 26.7 x 32.6 x 0.000785 = 12.3 kg.

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:::

= mm. x cm. x cm. 2 x 0.000785

20 mm. = 20 x 46 x 39 2 x 0.000785 = 14.1 kg.

32 mm. = 32 x 33.5 x 16.5 2 x 0.000785 = 6.9 kg.

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:::

= mm. x cm. x cm. x 0.00247

19 mm. = 19 x 14.5 x 14.5 x 0.00247 = 9.87 kg.

28 mm. = 28 x 17.5 x 17.5 x 0.00247 = 21.2 kg.

* cm

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:::

=(R - r ) x mm x 0.00247

25 mm. = (14.5 - 7 ) x 25 x 0.00247 = 161.25 x 25 x 0.00247

= 10 kg.

* cm

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:::

= mm. x mm. x 0.0471

12 mm. = 240 x 12 x 0.0471 = 135.6 kg.

4.5 mm. = 125 x 4.5 x 0.0471 = 26.5 kg.

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:::

=(A + B - 2 x mm) x mm x 0.0471

6 mm. = (60 + 75 - 2 x 6) x 6 x 0.0471 = (135 - 12) x 6 x 0.0471

= 123 x 6 x 0.0471

= 34.8 kg

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U :::

=(A + 2B - 4 x mm) x mm x 0.0471

8 mm. = (220 + 2 X 115 - 4 x 8) x 8 x 0.0471 = (220 + 230 - 32) x 8 x 0.0471

= 418 x 8 x 0.0471

= 157.5 kg

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C:::

=(A + 2B + 2C - 8 x mm) x mm x 0.0471

4.5 mm.

= (175 + 2 X 65 + 2 X 20 - 8 x 4.5) x 4.5 x 0.0471 = (175 + 130 + 40 - 36) x 4.5 x 0.0471

= 309 x 4.5 x 0.0471

= 65.5 kg

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, :::

= mm x 0.006167 x m.

130 mm. = 130 x 0.006167 x 4.6 = 479 kg

225 mm. = 225 x 0.006167 x 2.45 = 765 kg

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:::

= ( mm - mm) x 0.006167 x m

= (432 - 365 ) x 0.006167 x 2.78 = 915 kg

= (160 - 140 ) x 0.006167 x 5.55 = 205 kg