Math Problem Statement

Find the size of angle x in the figure.

Solution

To find the size of angle xx, we can use the following observations from the figure:

  1. The triangle has two angles labeled 41° and 94°. The sum of all interior angles in any triangle is 180°.

    So, the third angle of the triangle (the angle at the top left) can be found by subtracting: 1804194=45180^\circ - 41^\circ - 94^\circ = 45^\circ

  2. The angle xx is formed by an external line, and the 111° angle is supplementary to the unknown angle inside the triangle (the angle adjacent to xx).

    Since these two angles are on a straight line, they must add up to 180°: x+111=180x + 111^\circ = 180^\circ Solving for xx: x=180111=69x = 180^\circ - 111^\circ = 69^\circ

Thus, the size of angle xx is 69°.

Would you like a more detailed explanation or any clarifications?

Related Questions:

  1. What is the sum of the interior angles of a triangle?
  2. How do we calculate supplementary angles?
  3. Why do the interior angles of a triangle add up to 180°?
  4. How would you calculate the exterior angle in a different triangle?
  5. Can we use the same method for any other polygon?

Tip:

Always remember that the sum of angles on a straight line is 180°, which is helpful for solving problems involving external angles!

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Math Problem Analysis

Mathematical Concepts

Geometry
Angles
Triangles

Formulas

Sum of interior angles of a triangle: 180°
Supplementary angles: angle1 + angle2 = 180°

Theorems

Interior angles sum theorem
Supplementary angles theorem

Suitable Grade Level

Grades 7-9