What is the area of the tranglo with vertices L (-3, 5). M (4, 7). and N (2, –-8)? Uso any method to find the ans answer. 25.5 square units. 57.5 square units. 45.5 square units. 50.5 square units.
What is the area of the tranglo with vertices L (-3, 5). M (4, 7). and N (2, –-8)? Uso any method to find the ans answer. 25.5 square units. 57.5 square units. 45.5 square units. 50.5 square units.
Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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Question
![### Finding the Area of a Triangle on a Coordinate Plane
**Problem:**
What is the area of the triangle with vertices \( L(-3, 5) \), \( M(4, 7) \), and \( N(2, -8) \)? Use any method to find the answer.
**Graph Description:**
The graph provided shows a coordinate plane with a triangle outlined. The vertices of the triangle are marked as follows:
- \( L \) at coordinates \((-3, 5)\)
- \( M \) at coordinates \((4, 7)\)
- \( N \) at coordinates \((2, -8)\)
The x-axis and y-axis intersect at the origin \((0, 0)\). The grid lines are labeled incrementally with numbers, both positive and negative.
**Options:**
- 25.5 square units.
- 57.5 square units.
- 45.5 square units.
- 50.5 square units.
**Method:**
To find the area of a triangle given its vertices, you can use the formula:
\[
\text{Area} = \frac{1}{2} \left| x_1(y_2 - y_3) + x_2(y_3 - y_1) + x_3(y_1 - y_2) \right|
\]
Substitute the coordinates of \( L(-3, 5) \), \( M(4, 7) \), and \( N(2, -8) \):
- \( x_1 = -3 \), \( y_1 = 5 \)
- \( x_2 = 4 \), \( y_2 = 7 \)
- \( x_3 = 2 \), \( y_3 = -8 \)
Calculate the area:
\[
\begin{align*}
\text{Area} &= \frac{1}{2} \left| (-3)(7 - (-8)) + 4((-8) - 5) + 2(5 - 7) \right| \\
&= \frac{1}{2} \left| (-3)(15) + 4(-13) + 2(-2) \right| \\
&= \frac{1}{2} \left| (-45) + (-52) + (-4) \right| \\
&](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F010933bb-996f-4c09-be7e-04d96039007c%2F23eda849-c342-481a-9f89-9358ea46ca52%2Fclz835_processed.png&w=3840&q=75)
Transcribed Image Text:### Finding the Area of a Triangle on a Coordinate Plane
**Problem:**
What is the area of the triangle with vertices \( L(-3, 5) \), \( M(4, 7) \), and \( N(2, -8) \)? Use any method to find the answer.
**Graph Description:**
The graph provided shows a coordinate plane with a triangle outlined. The vertices of the triangle are marked as follows:
- \( L \) at coordinates \((-3, 5)\)
- \( M \) at coordinates \((4, 7)\)
- \( N \) at coordinates \((2, -8)\)
The x-axis and y-axis intersect at the origin \((0, 0)\). The grid lines are labeled incrementally with numbers, both positive and negative.
**Options:**
- 25.5 square units.
- 57.5 square units.
- 45.5 square units.
- 50.5 square units.
**Method:**
To find the area of a triangle given its vertices, you can use the formula:
\[
\text{Area} = \frac{1}{2} \left| x_1(y_2 - y_3) + x_2(y_3 - y_1) + x_3(y_1 - y_2) \right|
\]
Substitute the coordinates of \( L(-3, 5) \), \( M(4, 7) \), and \( N(2, -8) \):
- \( x_1 = -3 \), \( y_1 = 5 \)
- \( x_2 = 4 \), \( y_2 = 7 \)
- \( x_3 = 2 \), \( y_3 = -8 \)
Calculate the area:
\[
\begin{align*}
\text{Area} &= \frac{1}{2} \left| (-3)(7 - (-8)) + 4((-8) - 5) + 2(5 - 7) \right| \\
&= \frac{1}{2} \left| (-3)(15) + 4(-13) + 2(-2) \right| \\
&= \frac{1}{2} \left| (-45) + (-52) + (-4) \right| \\
&
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