If a piece of wire 40 cm long is bent into a arc of a circle subtending an angle of 60 degree at the

M4maths Previous Puzzles

26 Aug 2016 Radius of circle

If a piece of wire 40 cm long is bent into a arc of a circle subtending an angle of 60 degree at the centre, then the radius of the circle is (in cms)

OPtion

1) Pi/120
2) Pi/60
3) 90/Pi
4) 45/Pi
5) Pi/90
6) 120/Pi
7) Pi/30
8) Pi/45
9) 60/Pi
10)None of these

Solution

2 Pi R * 60/360 = 40
R = 40*360 / 2 Pi 60
R = 120/Pi

Option 6)

Correct Option: 6 Best Solution (6)