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:

  • A(2,2)A(-2, 2)
  • B(3,2)B(3, 2)
  • C(2,4)C(-2, -4)
  • D(3,4)D(3, -4)

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 AA and CC are the same, and the x-coordinates of BB and DD are the same, indicating vertical alignment. Similarly, the y-coordinates of AA and BB are the same, as are CC and DD, indicating horizontal alignment.


2. Check Congruent Segments

Step 1: Length of AB\overline{AB}

Use the distance formula:
d=(x2x1)2+(y2y1)2d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}
For AB\overline{AB}, where A(2,2)A(-2, 2) and B(3,2)B(3, 2):
dAB=(3(2))2+(22)2=(3+2)2+0=25=5d_{AB} = \sqrt{(3 - (-2))^2 + (2 - 2)^2} = \sqrt{(3 + 2)^2 + 0} = \sqrt{25} = 5

Step 2: Length of CD\overline{CD}

For C(2,4)C(-2, -4) and D(3,4)D(3, -4):
dCD=(3(2))2+(4(4))2=(3+2)2+0=25=5d_{CD} = \sqrt{(3 - (-2))^2 + (-4 - (-4))^2} = \sqrt{(3 + 2)^2 + 0} = \sqrt{25} = 5
So, ABCD\overline{AB} \cong \overline{CD}.

Step 3: Length of AC\overline{AC}

For A(2,2)A(-2, 2) and C(2,4)C(-2, -4):
dAC=((2)(2))2+(42)2=0+(6)2=36=6d_{AC} = \sqrt{((-2) - (-2))^2 + (-4 - 2)^2} = \sqrt{0 + (-6)^2} = \sqrt{36} = 6

Step 4: Length of BD\overline{BD}

For B(3,2)B(3, 2) and D(3,4)D(3, -4):
dBD=((3)(3))2+(42)2=0+(6)2=36=6d_{BD} = \sqrt{((3) - (3))^2 + (-4 - 2)^2} = \sqrt{0 + (-6)^2} = \sqrt{36} = 6
So, ACBD\overline{AC} \cong \overline{BD}.


3. Conclusion

  • Congruent Segments:
    ABCD\overline{AB} \cong \overline{CD} (both horizontal sides).
    ACBD\overline{AC} \cong \overline{BD} (both vertical sides).

  • Explanation:
    These segments are congruent because they have the same length, as calculated using the distance formula.


Would you like a detailed graph? Let me know!


Questions for Practice:

  1. What type of quadrilateral is formed by these points? Why?
  2. Are the diagonals of the shape congruent? Prove it using the distance formula.
  3. Calculate the slope of each side. What does this tell you about the angles of the quadrilateral?
  4. What is the perimeter of the quadrilateral?
  5. 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