Grade 8 | Maths | Mensuration | Free Tutorial | CBSE | ICSE | State Board

instyn education8 minutes read

Knowing the radius is essential for calculating the area of a circular park using the formula PI R square. In mensuration, students will learn to find the surface area and volume of 3D objects like cubes, cuboids, and cylinders.

Insights

  • Understanding the radius of a circle is essential for calculating the park's area using the formula PI R square.
  • The lesson on mensuration covers finding the surface area and volume of various 3D shapes, including cubes, cuboids, and cylinders, with specific formulas and methods for each shape.

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Recent questions

  • How do you calculate the area of a circular park?

    By using the formula PI R square.

  • What will students learn in a mensuration lesson?

    To find the surface area and volume of 3D objects.

  • How many sides does a cube have?

    Six sides.

  • What is the total surface area of a cuboid?

    2 times the sum of length times breadth, breadth times height, and height times length.

  • How is the total surface area of a cylinder calculated?

    By finding the areas of the two bases (PI R square) and the rectangle (2 PI R H), resulting in 2 PI R square plus 2 PI R H.

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Summary

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Calculating Area and Volume of 3D Shapes

  • To calculate the area of a circular park, knowing the radius is crucial as it allows for the use of the formula PI R square.
  • In the lesson on mensuration, students will learn to find the surface area and volume of 3D objects like cubes, cuboids, and cylinders.
  • A cube has six sides, each being a square, making its total surface area equal to 6 times the side length squared.
  • A cuboid has six rectangular faces, with the total surface area being 2 times the sum of the length times breadth, breadth times height, and height times length.
  • The total surface area of a cylinder is found by calculating the areas of the two bases (PI R square) and the rectangle (2 PI R H), resulting in 2 PI R square plus 2 PI R H.
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