Math Problem Statement

Find the value of x in a circle where an inscribed angle is 35° and an external angle is 141°.

Solution

This problem involves a circle with intersecting lines, and we need to find the value of angle xx.

Step-by-step solution:

  1. Identify the key angles:

    • There is an inscribed angle of 3535^\circ, adjacent to the angle xx.
    • An external angle 141141^\circ is also given.
  2. Recall the relationship between an exterior angle and the intercepted arc: The exterior angle theorem states that the exterior angle of a circle is equal to half the difference of the intercepted arcs.

    Specifically: Exterior Angle=12(Larger Intercepted ArcSmaller Intercepted Arc)\text{Exterior Angle} = \frac{1}{2}(\text{Larger Intercepted Arc} - \text{Smaller Intercepted Arc}) In this case, the angle xx is the exterior angle to the arc, so: x=12(14135)x = \frac{1}{2}(141^\circ - 35^\circ)

  3. Calculate xx: x=12(14135)=12×106=53x = \frac{1}{2}(141^\circ - 35^\circ) = \frac{1}{2} \times 106^\circ = 53^\circ

So, the value of xx is 53 degrees.


Would you like further clarification or details? Here are some related questions to expand on this:

  1. What is the exterior angle theorem and how does it apply to circles?
  2. How do we calculate the sum of opposite angles in a cyclic quadrilateral?
  3. What are inscribed and central angles in a circle, and how do they relate?
  4. How do intercepted arcs affect the calculation of angles in a circle?
  5. Can the exterior angle of a triangle be applied similarly in circle problems?

Tip: When solving circle geometry problems, look for relationships between angles, arcs, and lines, as these often help simplify complex configurations.

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Math Problem Analysis

Mathematical Concepts

Circle Geometry
Angles in Circles

Formulas

Exterior Angle = 1/2 (Larger Arc - Smaller Arc)

Theorems

Exterior Angle Theorem
Inscribed Angle Theorem

Suitable Grade Level

Grades 8-10