Question

A city has two perfectly circular and concentric ring roads, the outer ring road (or) being twice as long as the inner ring road (ir). There are also four (straight line) chord

Answer 1

Step-by-step explanation:

A city has two perfectly circular and concentric ring ... There are also four (straight line) chord roads from E1, the east end point of OR to N2, the north ... The two curves intersect ...

Answer 2

Answer :

length of OR = 2l (let) => length of IR = l

radius of OR = 2r (let) => radius of IR = r (radius is proportional to circumference)

=> length of chord = (r^2 + (2r)^2)^(1/2) = r(5^(1/2))

=> sum of length of all chords / length of OR = 4r(5^(1/2))/4(pi)r = sqrt(5) / (pi)