Step-by-step explanation:
Let the measure of required angle be x degree

Thus, first option is the correct answer.
Answer:
8 ft
Step-by-step explanation:
Set up a proportion: 10/16=5/x
Solve for x: 80=10x
x=8
Answer:2 3/5
Step-by-step explaination:
Answer:ok
Step-by-step explanation: