Forum Replies Created

  • Majida

    Member
    June 18, 2023 at 11:33 am in reply to: Finding the Area of a Rectangle with a Given Perimeter and Width

    Given:
    Width of the rectangle = 5 units
    Perimeter of the rectangle = 120 units

    Let’s assume the length of the rectangle is “x” times its width.

    The formula for the perimeter of a rectangle is given by:
    Perimeter = 2 × (Length + Width)

    Putting in the given values, we have:
    120 = 2 × (x * 5 + 5)

    Simplifying, we get:
    120 = 2 × (5x + 5)
    120 = 10x + 10
    10x = 120 – 10
    10x = 110
    x = 110/10
    x = 11

    Therefore, the length of the rectangle is 11 times its width.

    Now, let’s calculate the length:
    Length = x * Width Length = 11 * 5 Length = 55 units

    To find the area of the rectangle, we use the formula:
    Area = Length × Width

    Putting in the values, we get:
    Area = 55 × 5 Area = 275 square units

    Hence, the area of the rectangle is 275 square units.

  • Majida

    Member
    June 18, 2023 at 11:30 am in reply to: CLASS 7TH PERIMETER AND AREA

    Let the breadth of the rectangle be “b”.

    The length of the rectangle is twice the breadth, so it’s “2b”.

    The perimeter of the rectangle is 2x(b+2b) =6b.

    The wire bent in the form of a circle also has a circumference of 6b.

    Let “r” be the radius of the circle, that is,

    2πr=6b, implies, r= 6b/2π

    The area of the rectangle is 2b², and the area of the circle is 9b².

    So, according to the question, we have,

    Area of the circle – Area of the rectangle = 104.5

    9b² – 2b² = 104.5

    7b² = 104.5

    b² = 104.5 / 7

    b² = 14.93

    b ≈ √14.93 = 3.86

    The total length of the wire used is equal to the perimeter of the rectangle:

    Total length of wire = 6b
    = 6 × 3.86
    = 23.16

    Therefore, the length of the wire is approximately 23.16 cm.