Step-by-step explanation:
CD = AB
the inner angle at C = 25° = the outer angle at A.
so, the inner angle at A = 90 - 25 = 65°
now we use the law of sine
a/sin(A) = b/sin(B) = c/sin(C)
with a, b, c being the triangle sides, and A, B, C the angles opposite of the correlated sides.
so, in our case
555/sin(65) = AB/sin(25) = CD/sin(25)
CD = 555×sin(25)/sin(65) = 258.8007503...
≈ 258.8 m
