Answer:
A. 113°
Explanation:
opposite of the largest side is the largest angle
a=18 b=25 c=36
law of cosines
largest angle= arccos((a^2+b^2-c^2)/2ab))
largest angle= arccos((18^2+25^2-36^2)/2*18*25))
largest angle= arccos(-347/900)
largest angle= arccos(-0.38555555555)
largest angle= 1.96660618 rad
1rad × 180/π = 57.296
1.96660618×180/π=
112.678234078
