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Find the capacity of a rectangular cistern in litres whose dimensions are 11.2 m × 6 m × 5.8 m. Find the area of the iron sheet required to make the cistern, if it is hammered into a sheet to cover an area of 1 hectare.

Mathematics

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Answers

2 parts
i

343 m3\text{343 m}^3

196 m2\text{196 m}^2

294 m2\text{294 m}^2

ii

175.616 cm3\text{175.616 cm}^3

125.44 cm2\text{125.44 cm}^2

188.16 cm2\text{188.16 cm}^2

Step-by-step solution

6 steps

Part i· 3 steps

For a cube with edge length a=7a = 7 m

  1. Calculate the Volume (VV).

    The formula for the volume of a cube is V=a3V = a^3.

    V=(7 m)3V = (7 \text{ m})^3 V=7 m×7 m×7 mV = 7 \text{ m} \times 7 \text{ m} \times 7 \text{ m} V=343 m3V = 343 \text{ m}^3
  2. Calculate the Lateral Surface Area (LSA).

    The formula for the lateral surface area of a cube is LSA=4a2\text{LSA} = 4a^2.

    LSA=4×(7 m)2\text{LSA} = 4 \times (7 \text{ m})^2 LSA=4×49 m2\text{LSA} = 4 \times 49 \text{ m}^2 LSA=196 m2\text{LSA} = 196 \text{ m}^2
  3. Calculate the Total Surface Area (TSA).

    The formula for the total surface area of a cube is TSA=6a2\text{TSA} = 6a^2.

    TSA=6×(7 m)2\text{TSA} = 6 \times (7 \text{ m})^2 TSA=6×49 m2\text{TSA} = 6 \times 49 \text{ m}^2 TSA=294 m2\text{TSA} = 294 \text{ m}^2

    For a=7a = 7 m:
    Volume: 343 m3\boxed{\text{343 m}^3}
    Lateral Surface Area: 196 m2\boxed{\text{196 m}^2}
    Total Surface Area: 294 m2\boxed{\text{294 m}^2}

Part ii

175.616 cm3\text{175.616 cm}^3

For a cube with edge length a=5.6a = 5.6 cm

  1. Calculate the Volume (VV).

    The formula for the volume of a cube is V=a3V = a^3.

    V=(5.6 cm)3V = (5.6 \text{ cm})^3 V=5.6 cm×5.6 cm×5.6 cmV = 5.6 \text{ cm} \times 5.6 \text{ cm} \times 5.6 \text{ cm} V=175.616 cm3V = 175.616 \text{ cm}^3
  2. Calculate the Lateral Surface Area (LSA).

    The formula for the lateral surface area of a cube is LSA=4a2\text{LSA} = 4a^2.

    LSA=4×(5.6 cm)2\text{LSA} = 4 \times (5.6 \text{ cm})^2 LSA=4×31.36 cm2\text{LSA} = 4 \times 31.36 \text{ cm}^2 LSA=125.44 cm2\text{LSA} = 125.44 \text{ cm}^2
  3. Calculate the Total Surface Area (TSA).

    The formula for the total surface area of a cube is TSA=6a2\text{TSA} = 6a^2.

    TSA=6×(5.6 cm)2\text{TSA} = 6 \times (5.6 \text{ cm})^2 TSA=6×31.36 cm2\text{TSA} = 6 \times 31.36 \text{ cm}^2 TSA=188.16 cm2\text{TSA} = 188.16 \text{ cm}^2

    For a=5.6a = 5.6 cm:
    Volume: 175.616 cm3\boxed{\text{175.616 cm}^3}
    Lateral Surface Area: 125.44 cm2\boxed{\text{125.44 cm}^2}
    Total Surface Area: 188.16 cm2\boxed{\text{188.16 cm}^2}

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