Math Problem Statement

An architect wants to draw a rectangle with a diagonal of 1313 inches. The length of the rectangle is to be 22 inches more than twice the width. What dimensions should she make the rectangle? 

Solution

Let the width of the rectangle be denoted by ww, and the length of the rectangle be ll.

According to the problem:

  • The length is 22 inches more than twice the width:
    l=2w+22l = 2w + 22

We also know that the diagonal of the rectangle is given as 1313 inches. Using the Pythagorean theorem, we can relate the width, length, and diagonal as follows: l2+w2=13132l^2 + w^2 = 1313^2

Now, substitute l=2w+22l = 2w + 22 into the equation: (2w+22)2+w2=13132(2w + 22)^2 + w^2 = 1313^2

We will now solve this equation to find the value of ww, and subsequently calculate ll.

First, expand (2w+22)2(2w + 22)^2: (2w+22)2=4w2+88w+484(2w + 22)^2 = 4w^2 + 88w + 484

Now substitute back into the equation: 4w2+88w+484+w2=131324w^2 + 88w + 484 + w^2 = 1313^2

Simplify the equation: 5w2+88w+484=17231695w^2 + 88w + 484 = 1723169

Now, subtract 484 from both sides: 5w2+88w=17226855w^2 + 88w = 1722685

At this point, we can solve this quadratic equation. Let me calculate the value of ww.The two solutions for the width ww are:

w=44+86153615orw=4486153615w = \frac{-44 + \sqrt{8615361}}{5} \quad \text{or} \quad w = \frac{-44 - \sqrt{8615361}}{5}

Since the width must be a positive value, we take the positive solution: w=44+86153615w = \frac{-44 + \sqrt{8615361}}{5}

Let me calculate this value for ww.The width ww of the rectangle is approximately 578.24578.24 inches.

Now, using the relation l=2w+22l = 2w + 22, let's calculate the length ll.The length ll of the rectangle is approximately 1178.481178.48 inches.

Thus, the dimensions of the rectangle should be:

  • Width: 578.24578.24 inches
  • Length: 1178.481178.48 inches

Would you like further details or clarification?

Here are 5 related questions you might find interesting:

  1. How does the Pythagorean theorem apply to non-right triangles?
  2. Can you derive the quadratic formula from the standard form of a quadratic equation?
  3. How would the problem change if the diagonal was a different length?
  4. What if the length was described as 10 inches more than three times the width?
  5. How would you calculate the perimeter of this rectangle?

Tip: Always ensure that the values you obtain in a word problem are reasonable based on the context before finalizing your answer.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Geometry
Algebra
Quadratic Equations
Pythagorean Theorem

Formulas

Pythagorean theorem: a^2 + b^2 = c^2
Quadratic equation: ax^2 + bx + c = 0

Theorems

Pythagorean Theorem
Quadratic Formula

Suitable Grade Level

Grades 10-12