Math Problem Statement
Plot the following points in a coordinate plane: A (–2, 2), B (3, 2), C (–2, –4), D (3, –4) Is congruent to ? Explain. Is there another pair of congruent segments? If so, name the segments and explain why they are congruent.
Solution
Let’s solve this step-by-step:
1. Plot the Points on a Coordinate Plane
The points given are:
We can place these points in a coordinate plane. The x-values and y-values suggest these points will form a rectangle since the x-coordinates of and are the same, and the x-coordinates of and are the same, indicating vertical alignment. Similarly, the y-coordinates of and are the same, as are and , indicating horizontal alignment.
2. Check Congruent Segments
Step 1: Length of
Use the distance formula:
For , where and :
Step 2: Length of
For and :
So, .
Step 3: Length of
For and :
Step 4: Length of
For and :
So, .
3. Conclusion
-
Congruent Segments:
(both horizontal sides).
(both vertical sides). -
Explanation:
These segments are congruent because they have the same length, as calculated using the distance formula.
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Questions for Practice:
- What type of quadrilateral is formed by these points? Why?
- Are the diagonals of the shape congruent? Prove it using the distance formula.
- Calculate the slope of each side. What does this tell you about the angles of the quadrilateral?
- What is the perimeter of the quadrilateral?
- What is the area of the quadrilateral?
Tip: When determining whether sides or diagonals are congruent, always use the distance formula and carefully track each point’s coordinates!
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Math Problem Analysis
Mathematical Concepts
Coordinate Geometry
Congruence
Distance Calculation
Formulas
Distance formula: d = √((x2 - x1)^2 + (y2 - y1)^2)
Theorems
Congruence of line segments is based on equal lengths.
Suitable Grade Level
Grades 6-8
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