DAV Class 8 Maths Formulas Quiz

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6 Questions

What is the formula for finding the volume of a cylinder?

$ ext{Volume} = ext{Base Area} imes ext{Height}$

What is the formula for the surface area of a cone?

$ ext{Surface Area} = ext{Base Area} + ext{Lateral Area}$

State the Pythagorean theorem.

$a^2 + b^2 = c^2$

Explain the steps involved in finding the area of a trapezium.

The area of a trapezium can be found by adding the lengths of the parallel sides, multiplying by the height, and dividing by 2.

Describe the process of finding the perimeter of a rhombus.

To find the perimeter of a rhombus, add all four sides together.

Explain the concept of finding the mean of a set of numbers.

The mean of a set of numbers is calculated by adding all the numbers together and then dividing by the total count of numbers in the set.

Study Notes

Formulas and Theorems

  • The formula for finding the volume of a cylinder is V = πr²h, where V is the volume, π is a constant approximately equal to 3.14, r is the radius of the base, and h is the height of the cylinder.

Surface Area of a Cone

  • The formula for the surface area of a cone is SA = πr(r + l), where SA is the surface area, π is a constant approximately equal to 3.14, r is the radius of the base, and l is the slant height of the cone.

Pythagorean Theorem

  • The Pythagorean theorem states that a² + b² = c², where a and b are the lengths of the legs of a right-angled triangle, and c is the length of the hypotenuse.

Area of a Trapezium

  • To find the area of a trapezium, follow these steps:
    • Measure or calculate the lengths of the parallel sides (a and b) and the height (h) of the trapezium.
    • Multiply the height by the average of the lengths of the parallel sides: Area = (a + b) / 2 × h.

Perimeter of a Rhombus

  • To find the perimeter of a rhombus, follow these steps:
    • Measure or calculate the length of one side of the rhombus.
    • Multiply the length by 4, since all sides of a rhombus are equal: Perimeter = 4 × side length.

Mean of a Set of Numbers

  • To find the mean of a set of numbers, follow these steps:
    • Add up all the numbers in the set to find the total sum.
    • Divide the total sum by the number of items in the set: Mean = Sum / Number of items.

Test your knowledge of mathematical formulas with questions on the volume of a cylinder, the Pythagorean theorem, and the surface area of a cone.

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