Answer:
18π mm
Step-by-step explanation:
C=2πr
d=2r, 18=2r, r=9
C=18π mm
Answer:
The angle of depression from Platform A to Platform B is 
Step-by-step explanation:
Refer the attached figure
The horizontal distance between the platforms is 500 feet i.e. BC = 500
The length of the zip-line is 685 feet i.e. AB = 685
We are supposed to find the angle of depression from Platform A to Platform B
Hypotenuse = 685
Base = 500

Hence the angle of depression from Platform A to Platform B is 
It would be (x-4)^2
It has a horizontal shift of 4 to the right
Answer:
students preferred alternative music
= 461/1940 ×100%=23.7%