Answer:
Step-by-step explanation:
90°
Angle C = arccos((84²+13²-85²)/(2×84×13))
= arccos(0/2184)
= arccos(0)
= 90°
Answered by GAUTHMATH
B.
21 X 2 = 42
42-7 = 35
35 + 21 = 56
It is A
