Math Problem Statement
Solution
To find the size of angle , we can use the following observations from the figure:
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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:
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The angle is formed by an external line, and the 111° angle is supplementary to the unknown angle inside the triangle (the angle adjacent to ).
Since these two angles are on a straight line, they must add up to 180°: Solving for :
Thus, the size of angle is 69°.
Would you like a more detailed explanation or any clarifications?
Related Questions:
- What is the sum of the interior angles of a triangle?
- How do we calculate supplementary angles?
- Why do the interior angles of a triangle add up to 180°?
- How would you calculate the exterior angle in a different triangle?
- 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
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