Math Problem Statement

what is the area of a triangle defined by the points A(-2,-2) B (4,-2) C(6,3)

Solution

To find the area of a triangle defined by three points in the coordinate plane, we can use the following formula:

Area=12x1(y2y3)+x2(y3y1)+x3(y1y2)\text{Area} = \frac{1}{2} \left| x_1(y_2 - y_3) + x_2(y_3 - y_1) + x_3(y_1 - y_2) \right|

Let the coordinates of points A(x1,y1)=(2,2)A(x_1, y_1) = (-2, -2), B(x2,y2)=(4,2)B(x_2, y_2) = (4, -2), and C(x3,y3)=(6,3)C(x_3, y_3) = (6, 3).

Substituting these values into the formula:

Area=122(23)+4(3(2))+6((2)(2))\text{Area} = \frac{1}{2} \left| -2(-2 - 3) + 4(3 - (-2)) + 6((-2) - (-2)) \right| =122(5)+4(5)+6(0)= \frac{1}{2} \left| -2(-5) + 4(5) + 6(0) \right| =1210+20+0= \frac{1}{2} \left| 10 + 20 + 0 \right| =12×30=15= \frac{1}{2} \times 30 = 15

Thus, the area of the triangle is 15 square units.

Would you like more details or have any questions?

Here are 5 related questions to expand on this concept:

  1. How would the area formula change if the points were in three dimensions?
  2. What happens if the points are collinear, and how would you verify that?
  3. Can you derive the formula for the area of a triangle using the determinant method?
  4. How does the area of a triangle relate to its perimeter in specific cases (like equilateral triangles)?
  5. What is the centroid of this triangle, and how is it calculated?

Tip: When using this formula, ensure the order of the vertices follows a consistent direction to avoid sign errors.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Geometry
Coordinate Geometry
Area of a Triangle

Formulas

Area of a triangle = 1/2 * |x1(y2 - y3) + x2(y3 - y1) + x3(y1 - y2)|

Theorems

Area of triangle using coordinates theorem

Suitable Grade Level

Grades 8-10