Math Problem Statement

The base of a triangular piece of fabric is 8in more than the height. The area is 600in2. Find the base and height of the triangle. Round your answer to the nearest tenth of a inch.

Solution

To solve for the base and height of the triangle, we'll use the formula for the area of a triangle:

Area=12×base×height\text{Area} = \frac{1}{2} \times \text{base} \times \text{height}

Given:

  • The area of the triangle Area=600in2\text{Area} = 600 \, \text{in}^2
  • The base is 8 inches more than the height. If we let the height be hh inches, then the base will be h+8h + 8 inches.

Using the area formula:

600=12×(h+8)×h600 = \frac{1}{2} \times (h + 8) \times h

Simplify and solve for hh:

600=12×(h2+8h)600 = \frac{1}{2} \times (h^2 + 8h)

Multiply both sides by 2 to eliminate the fraction:

1200=h2+8h1200 = h^2 + 8h

Now, rearrange the equation into a standard quadratic form:

h2+8h1200=0h^2 + 8h - 1200 = 0

This quadratic equation can be solved using the quadratic formula:

h=b±b24ac2ah = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

Here, a=1a = 1, b=8b = 8, and c=1200c = -1200. Substituting these values into the formula:

h=8±824(1)(1200)2(1)h = \frac{-8 \pm \sqrt{8^2 - 4(1)(-1200)}}{2(1)}

h=8±64+48002h = \frac{-8 \pm \sqrt{64 + 4800}}{2}

h=8±48642h = \frac{-8 \pm \sqrt{4864}}{2}

h=8±69.72h = \frac{-8 \pm 69.7}{2}

Now, calculate the two possible values for hh:

  1. h=8+69.72=61.72=30.85h = \frac{-8 + 69.7}{2} = \frac{61.7}{2} = 30.85
  2. h=869.72=77.72=38.85h = \frac{-8 - 69.7}{2} = \frac{-77.7}{2} = -38.85

Since height cannot be negative, the valid height is:

h30.85inchesh \approx 30.85 \, \text{inches}

Now, calculate the base:

base=h+830.85+8=38.85inches\text{base} = h + 8 \approx 30.85 + 8 = 38.85 \, \text{inches}

So, the base is approximately 38.938.9 inches, and the height is approximately 30.930.9 inches.

Would you like further details or have any questions? Here are five related questions:

  1. How do you derive the quadratic formula?
  2. What is the geometric significance of a triangle's area?
  3. How would the problem change if the area were different?
  4. What are the properties of a triangle with a specific base and height ratio?
  5. How would you verify the solution using an alternative method?

Tip: When solving quadratic equations, always check for both positive and negative roots, and ensure the solution makes sense in the context of the problem.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Geometry
Quadratic Equations

Formulas

Area of a Triangle
Quadratic Formula

Theorems

-

Suitable Grade Level

Grades 9-12