A
B
C
D
Explanation
Correct answer: D.
Choice D is correct. The sum of the angle measures of a triangle is . Adding the measures of angles and gives . Therefore, the measure of angle is .
Desmos solution:
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice A
Choice A is incorrect and may result from subtracting the sum of the measures of angles and from , instead of from .
Choice B
Choice B is incorrect and may result from subtracting the measure of angle from the measure of angle .
Choice C
Choice C is incorrect and may result from adding the measures of angles and but not subtracting the result from .