Math Problem Statement

In the figure, AB intersects CD at point E. Determine ∠AED. Explain how you determined the angle measure. In the second figure, PQ intersects SR at point T. Determine each angle measure and explain how you determined them.

Solution

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Question 1

In the first figure:

  • Given: 1=41\angle 1 = 41^\circ, 2=25\angle 2 = 25^\circ, and you need to determine AED\angle AED.

  • Explanation:

    • Use the Vertical Angle Theorem, which states that vertical angles are congruent. For example, 1\angle 1 and the angle directly opposite it are equal.
    • Similarly, AED\angle AED is the sum of 1\angle 1 and 2\angle 2, as it spans those two smaller angles.

    Calculation: AED=1+2=41+25=66\angle AED = \angle 1 + \angle 2 = 41^\circ + 25^\circ = 66^\circ

Question 2

In the second figure:

  • Given: 1=2x+24\angle 1 = 2x + 24^\circ, 2=3x\angle 2 = 3x. You need to determine the value of xx and then find each angle measure.

  • Explanation:

    • Angles on a straight line add up to 180180^\circ. Thus: 1+2=180\angle 1 + \angle 2 = 180^\circ
    • Substitute the given values: (2x+24)+3x=180(2x + 24) + 3x = 180
    • Solve for xx: 5x+24=1805x + 24 = 180 5x=1565x = 156 x=31.2x = 31.2
    • Use xx to calculate the angles: 1=2(31.2)+24=62.4+24=86.4\angle 1 = 2(31.2) + 24 = 62.4 + 24 = 86.4^\circ 2=3(31.2)=93.6\angle 2 = 3(31.2) = 93.6^\circ

    The measures of 1\angle 1 and 2\angle 2 are 86.486.4^\circ and 93.693.6^\circ, respectively.


Would you like a detailed explanation of these calculations or additional help with similar problems? Here are some related questions you might consider:

  1. How is the Vertical Angle Theorem applied in different configurations?
  2. Why do angles on a straight line sum to 180180^\circ?
  3. What are alternate interior angles, and when are they equal?
  4. How do you determine if two lines are parallel using angle relationships?
  5. How can you check if your angle calculations are correct?

Tip: Always double-check your angle sums to ensure they satisfy geometric properties, such as 180180^\circ for a straight line or 360360^\circ for a full circle.

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Math Problem Analysis

Mathematical Concepts

Geometry
Angle Relationships
Linear Pairs
Vertical Angles

Formulas

Sum of angles on a straight line = 180°

Theorems

Vertical Angle Theorem
Linear Pair Postulate

Suitable Grade Level

Grades 7-10