Math Problem Statement

area is 24cm Perimeter is 24cm No complicated stuff please No quadratics Tell me the length and width

Solution

To find the length and width of a rectangle given the area and perimeter, we can use two simple formulas:

  1. Area (A): A=length×widthA = \text{length} \times \text{width}
  2. Perimeter (P): P=2(length+width)P = 2(\text{length} + \text{width})

We know:

  • A=24cm2A = 24 \, \text{cm}^2
  • P=24cmP = 24 \, \text{cm}

Let's call the length ll and the width ww.

From the perimeter formula, we can express one equation: 2(l+w)=24l+w=122(l + w) = 24 \quad \Rightarrow \quad l + w = 12

From the area formula: l×w=24l \times w = 24

Now, we have the system of equations:

  1. l+w=12l + w = 12
  2. l×w=24l \times w = 24

We can solve for one variable, say ww, from the first equation: w=12lw = 12 - l

Substitute this into the second equation: l×(12l)=24l \times (12 - l) = 24 Expanding this: 12ll2=2412l - l^2 = 24 Simplifying: l212l+24=0l^2 - 12l + 24 = 0

This is a quadratic equation, but since you asked for no quadratic solving, you can use trial and error or estimation to find that the length ll is approximately 6 cm and the width ww is approximately 4 cm.

Would you like more details on this process or have any questions?

Here are 5 related questions:

  1. How would the dimensions change if the perimeter were increased?
  2. What if the area were doubled, but the perimeter stayed the same?
  3. How do you solve for dimensions if the shape is a square?
  4. Can you find the diagonal length of the rectangle using these dimensions?
  5. How would this problem change if you were working with a triangle?

Tip: For problems like this, even if quadratic equations arise, simple estimation or factoring can help if you avoid formal quadratic solutions!

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Math Problem Analysis

Mathematical Concepts

Geometry
Rectangular Area
Perimeter

Formulas

Area (A) = length × width
Perimeter (P) = 2(length + width)

Theorems

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Suitable Grade Level

Grades 5-7