Question

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

127°
127 degrees

86°
86 degrees

139°
139 degrees

94°

Answer 1

To find the measure of the exterior angle \( x \) formed by extending a line from the top vertex of the triangle, we can use the properties of triangles and exterior angles.

1. First, we note that the sum of the interior angles of a triangle is always 180 degrees. In this case, we have two of the interior angles:
- Left angle: 41 degrees
- Right angle: 53 degrees

2. We can calculate the third interior angle \( A \):
\[
A = 180^\circ - (41^\circ + 53^\circ)
\]
\[
A = 180^\circ - 94^\circ = 86^\circ
\]

3. The exterior angle \( x \) at the top vertex of the triangle is equal to the sum of the two remote (non-adjacent) interior angles, which are the angles at the left and right vertices:
\[
x = 41^\circ + 53^\circ
\]
\[
x = 94^\circ
\]

Thus, the value of angle \( x \) is \( 94^\circ \).

So the correct response is:
**94°**