Trigonometry (11th Edition)
Trigonometry (11th Edition)
11th Edition
ISBN: 9780134217437
Author: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher: PEARSON
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### Example 2: Calculate the Area of Triangle ABC

Given the following coordinates, calculate the area of the triangle formed by the points A, B, and C:

#### Option A
- \( A(2, 1, 1) \)
- \( B(4, 3, 0) \)
- \( C(1, 3, -2) \)

#### Option B
- \( A(0, 0, 0) \)
- \( B(-1, 2, 3) \)
- \( C(1, 2, 6) \)

#### Option C
- \( A(1, 3, 2) \)
- \( B(2, -1, 0) \)
- \( C(1, 10, 6) \)

Use the determinant method for calculating the area of a triangle in three-dimensional space. If the coordinates of the vertices are \( A(x_1, y_1, z_1) \), \( B(x_2, y_2, z_2) \), and \( C(x_3, y_3, z_3) \), then the area of triangle ABC is given by:

\[
\text{Area} = \frac{1}{2} \left| \begin{vmatrix}
x_1 & y_1 & z_1 & 1 \\
x_2 & y_2 & z_2 & 1 \\
x_3 & y_3 & z_3 & 1 \\
\end{vmatrix} \right|
\]

### Steps for Calculation:
1. Form the matrix using the coordinates of the given points.
2. Compute the determinant of the formed matrix.
3. Apply the formula to find the area of the triangle.
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Transcribed Image Text:### Example 2: Calculate the Area of Triangle ABC Given the following coordinates, calculate the area of the triangle formed by the points A, B, and C: #### Option A - \( A(2, 1, 1) \) - \( B(4, 3, 0) \) - \( C(1, 3, -2) \) #### Option B - \( A(0, 0, 0) \) - \( B(-1, 2, 3) \) - \( C(1, 2, 6) \) #### Option C - \( A(1, 3, 2) \) - \( B(2, -1, 0) \) - \( C(1, 10, 6) \) Use the determinant method for calculating the area of a triangle in three-dimensional space. If the coordinates of the vertices are \( A(x_1, y_1, z_1) \), \( B(x_2, y_2, z_2) \), and \( C(x_3, y_3, z_3) \), then the area of triangle ABC is given by: \[ \text{Area} = \frac{1}{2} \left| \begin{vmatrix} x_1 & y_1 & z_1 & 1 \\ x_2 & y_2 & z_2 & 1 \\ x_3 & y_3 & z_3 & 1 \\ \end{vmatrix} \right| \] ### Steps for Calculation: 1. Form the matrix using the coordinates of the given points. 2. Compute the determinant of the formed matrix. 3. Apply the formula to find the area of the triangle.
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