Question

the inner circumference of a circuler track is 440 cm. the track is 14cm wide. find the diameter of the outer circle of the track

Answer 1

Circumference(inner) = 2 * 22/7 * . 440 = 2* 22/7 *r  

∴ r = 70 cm

SO, the radius of the outer circle is 70+14= 84 m,

∴ the diameter is r * 2 = 84 * 2= 168 m ans

Answer 2

The inner circumference of a circuler track is 440 [Given]

the track is 14cm wide. [Given]

diameter of the outer circle of the track =?

Let inner radius be r metres.

Then, 2πr = 440 ; [circumference =2πr]

r = 440×7/44

= 70 m.

Radius of outer circle = (70 + 14) m = 84m [inner radius +track wide]

diameter of the outer circle of the track = 2*84 =168 m [dia=2* radius]

diameter of the outer circle of the track =168 m ANS