I think you can use cosine rule if only the lines that form the <52 are equal.
Angle 6, angle 4, angle 3, and angle 2 are all exterior angles.
Hope this helps!
Answer: It would be C and D
Step-by-step explanation:
By the phythagorean theorem, the 2 legs would equal to the hypothesize.
Choice A would not form a triangle.
Choice B does not follow the pythagorean theorem. 84 plus 16 does not equal 100.
Choice C does. 8 + 121 = 129.
Choice D does. 1 + 3 = 4.