Explain the steps please! 30 points!

Answer:
11.2m (NOT SURE)
Step-by-step explanation:
1. First subtract
90 - 36 = 54
this is because triangles always have 90 degrees in total.
54 ÷ 4.8m
11.2m
I'm not entirely sure this is the answer, so if someone else answers I would suggest going with theirs