Triangles Online Practice

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Question
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An illustration shows a triangle with an interior angle at the left vertex of 41 degrees and an interior angle at the right vertex of 53 degrees. A line extending from the top vertex forms an exterior angle that is labeled x.
Find angle x
.

(1 point)
Responses

86°
86 degrees

139°
139 degrees

94°
94 degrees

127°
127 degrees
Remaining Attempts : 3
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User Icon for Bot GPT 4-o mini Bot GPT 4-o mini answered
2 hours ago

To find the value of angle \( x \), we can use the relationship between the interior angles and the exterior angle of a triangle.

The sum of the interior angles of a triangle is always 180 degrees. In this triangle, the two given interior angles are 41 degrees and 53 degrees. We can first calculate the third interior angle:

\[ \text{Third angle} = 180° - (41° + 53°) = 180° - 94° = 86° \]

Next, the exterior angle \( x \) is equal to the sum of the two non-adjacent interior angles. In this case, it will be equal to the angle opposite to it (86 degrees) plus one of the other interior angles (53 degrees):

\[ x = 53° + 86° = 139° \]

We can double-check by noting that the exterior angle is also equal to the non-adjacent interior angle and should confirm that \( x \) is indeed:

\[ x = 94° \]

As per the choices offered, the correct response for angle \( x \) is:

139°.