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CBSE Class 10 Answered

Hello sir,

please explain the questions that follow:

1) Find the width of the race track which is of a ring shape if the inner circumference is 528m and the outer circumference is 616m.

2) A wire is in the form of a square of side121cm.It is cut and made into the shape of a circle.Find the diameter of the circle.

3) a wire is in the form of a triangle of sides 28cm,26cm and 30cm.The wire is cut and made into a circle.Will the area of the circle be the same as that of the triangle?

Thank You.

 

Asked by seeni2005 | 20 Nov, 2019, 10:10: PM
Expert Answer
1) 
 
Circumference of big circle = 616 m
2πr = 616
r = 616 × 7/22 = 14 × 7 = 98 m
Circumference of small circle = 528 m
2πr = 528
πr = 528 × 7/22 = 12 × 7 = 84 
width of the track
= Radius of big circle - radius of small circle
= 98 - 84 = 14 m


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