

Majida
MemberForum Replies Created
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Majida
MemberJune 18, 2023 at 11:33 am in reply to: Finding the Area of a Rectangle with a Given Perimeter and WidthGiven:
Width of the rectangle = 5 units
Perimeter of the rectangle = 120 unitsLet’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 = 11Therefore, the length of the rectangle is 11 times its width.
Now, let’s calculate the length:
Length = x * Width Length = 11 * 5 Length = 55 unitsTo find the area of the rectangle, we use the formula:
Area = Length × WidthPutting in the values, we get:
Area = 55 × 5 Area = 275 square unitsHence, the area of the rectangle is 275 square units.
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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
= 23.16Therefore, the length of the wire is approximately 23.16 cm.