Math Problem Statement

Find the measure of each marked angle. The larger angle measures: (21x + 19)° and the smaller angle measures: (14x + 4)°. Solve for x and determine the angle measures.

Solution

In the image, the problem is asking for the measures of two angles, represented algebraically as:

  • The larger angle is given by the expression (21x+19)(21x + 19)^\circ
  • The smaller angle is given by the expression (14x+4)(14x + 4)^\circ

The two angles appear to be linear pair angles, meaning they are adjacent and their measures add up to 180180^\circ since a linear pair always forms a straight line.

Let's solve for xx:

  1. The sum of the two angles must be 180180^\circ. So, we can set up the equation: (21x+19)+(14x+4)=180(21x + 19) + (14x + 4) = 180

  2. Combine like terms: 21x+14x+19+4=18021x + 14x + 19 + 4 = 180 35x+23=18035x + 23 = 180

  3. Subtract 23 from both sides: 35x=15735x = 157

  4. Divide by 35: x=157354.49x = \frac{157}{35} \approx 4.49

Now, substitute xx back into the expressions for the angles:

  • Larger angle: 21x+19=21(4.49)+19=94.29+19=113.2921x + 19 = 21(4.49) + 19 = 94.29 + 19 = 113.29^\circ

  • Smaller angle: 14x+4=14(4.49)+4=62.86+4=66.8614x + 4 = 14(4.49) + 4 = 62.86 + 4 = 66.86^\circ

Conclusion:

  • The larger angle measures approximately 113.29°.
  • The smaller angle measures approximately 66.86°.

Would you like a more detailed explanation, or do you have any further questions?


Here are 5 related questions you can explore:

  1. What are complementary and supplementary angles?
  2. How do we solve systems of linear equations in geometry?
  3. How can we verify the solution by checking the sum of the angles?
  4. What is the relationship between adjacent angles in polygons?
  5. How can we solve angle problems involving more complex expressions?

Tip: When working with linear pairs, always remember that their sum will be 180°, as they form a straight line.

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Math Problem Analysis

Mathematical Concepts

Linear Pair of Angles
Algebra

Formulas

Linear pair: Angle1 + Angle2 = 180°
Substitution and solving equations

Theorems

Linear Pair Theorem: Adjacent angles formed by two intersecting lines add up to 180°

Suitable Grade Level

Grades 8-10