Math Problem Statement
Find the length and width (in meters) of a rectangle that has the given perimeter and a maximum area. (Enter your answers as a comma-separated list.)
Perimeter: 56 meters m
Solution
To maximize the area of a rectangle with a given perimeter, the rectangle must be a square. Here's how we can solve for the length and width:
Step 1: Perimeter formula
The formula for the perimeter of a rectangle is: where is the length and is the width. Given the perimeter is 56 meters: Simplifying: (Equation 1)
Step 2: Area formula
The area of a rectangle is given by: We want to maximize this area while satisfying .
Step 3: Condition for maximum area
For a given perimeter, the area of a rectangle is maximized when the rectangle is a square. This means .
Step 4: Solving for and
Using in Equation (1): Since , the width is also 14 meters.
Final answer:
The length and width are both 14 meters. Therefore, the dimensions are:
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Related Questions:
- How does the shape of the rectangle affect its area when the perimeter is fixed?
- What is the formula to calculate the area of a rectangle?
- How can we derive the formula for the perimeter of any polygon?
- What if the rectangle’s length is twice its width? What would the area and dimensions be then?
- What happens to the area when the perimeter of a shape increases?
Tip:
Maximizing the area for a given perimeter often leads to shapes that are symmetrical, such as squares in the case of rectangles!
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Math Problem Analysis
Mathematical Concepts
Geometry
Optimization
Formulas
Perimeter of a rectangle: P = 2L + 2W
Area of a rectangle: A = L × W
Theorems
For a fixed perimeter, the area of a rectangle is maximized when it is a square.
Suitable Grade Level
Grades 7-9
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