The inner circumference of a circular track is 440 cm. the track is 14 cm wide. find the diameter of the outer circle of the track. (1) 84 cm (2) 168 cm (3) 336 cm (4) 77 cm
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The inner circumference = 440 cm
CIRCUMFERENCE = 2 × 22/7 × r
440 = 44/7 × r
=> r = 440 × 7/44
r = 70 cm
Diameter of inner circle = 2 × r
= 140 cm
On both sides the of the inner diameter the circular track is 14 cm wide
Therefore,
Outer diameter = Inner diameter + 14 + 14
=> 140 + 14 + 14
=> 158 cm
OUTER DIAMETER = 158 cm
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