Math Problem Statement

Find the measure of each marked angle. Assume the lines are parallel. The angles are (2x - 23)° and (x + 2)°.

Solution

In the provided image, we have two parallel lines cut by a transversal, creating two marked angles: (2x23)(2x - 23)^\circ and (x+2)(x + 2)^\circ. Since the lines are parallel, the marked angles are alternate interior angles, which means they are congruent (equal).

Thus, we can set up the following equation:

2x23=x+22x - 23 = x + 2

Solving for xx:

  1. Subtract xx from both sides:

2xx23=22x - x - 23 = 2

x23=2x - 23 = 2

  1. Add 23 to both sides:

x=25x = 25

Finding the measure of each angle:

  • Substitute x=25x = 25 into (2x23)(2x - 23)^\circ:

2(25)23=5023=272(25) - 23 = 50 - 23 = 27^\circ

  • Substitute x=25x = 25 into (x+2)(x + 2)^\circ:

25+2=2725 + 2 = 27^\circ

Thus, both angles are 2727^\circ.

Would you like any additional details or further explanation?

Here are 5 related questions:

  1. What are alternate interior angles?
  2. How do you determine if two angles are congruent when parallel lines are involved?
  3. Can alternate interior angles be supplementary? Why or why not?
  4. How would the solution change if the lines were not parallel?
  5. What other angle relationships are formed when two parallel lines are cut by a transversal?

Tip: Always check for congruent angle relationships like alternate interior, corresponding, or vertically opposite angles when working with parallel lines.

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Math Problem Analysis

Mathematical Concepts

Algebra
Parallel Lines
Angles
Alternate Interior Angles

Formulas

Equating alternate interior angles: 2x - 23 = x + 2

Theorems

Alternate Interior Angles Theorem

Suitable Grade Level

Grades 7-10