Gitta writes Angle 1 + Angle 2 + Angle 3 = 180 degrees or 1 + 2 + 3 = 180 by using the triangle sum theorem option (A) is correct.
What is the triangle?
In terms of geometry, the triangle is a three-sided polygon with three edges and three vertices. The triangle's interior angles add up to 180°.
We have a triangle shown in the picture.
As we can see in the picture there is three angles are given:
The angle 1, angle 2, angle 3
Also, from the definition of the triangle, the sum of the interior angles of a triangle is 180 degrees.
Adding all the angles of the triangle:
Angle 1 + Angle 2 + Angle 3 = 180 degrees
or
1 + 2 + 3 = 180
We can write the above equation by using the triangle sum theorem.
Thus, Gitta writes Angle 1 + Angle 2 + Angle 3 = 180 degrees or 1 + 2 + 3 = 180 by using the triangle sum theorem option (A) is correct.
Learn more about the triangle here:
brainly.com/question/25813512
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