Math, asked by nicksonnick0667, 10 months ago

wheel of a car covers a distance of 3520 cm in 20 rotations. Find the radius of the wheel

2.
The cost of fencing a circular race course at the rate of 78 per metre is 22112. Find the
diameter of the race course.
The cost of fencing
3. A path 2 m
long
path 2 m long and l m broad is constructed around a rectangular ground of
dimensions 120 m and 90 m respectively. Find the area of the path.
The cost of decorating the circumference of a circular lawn of a house at the rate of 255
per metre is 216940. What is the radius of the lawn?
5
Four circles are drawn side by side in a line and enclosed by a rectangle as shown below.
Tf the radius of each of the circles is 3 cm, then calculate:
(i) The area of the rectangle.
(ii) The area of each circle.
(iii) The shaded area inside the rectangle.​

Answers

Answered by amitnrw
1

R = 28 cm

Step-by-step explanation:

1. Wheel of a car covers a distance of 3520 cm in 20 rotations. Find the radius of the wheel

Circumference of Wheel = 2πR

Distance in 20 Rotation = 20 * 2πR  = 3520

=> πR = 88

=> (22/7) R = 88

=> R = 28 cm

2.  Cost of Fencing  = 22112

  Rate of Fencing = 78 per m

 Length of Fencing = Circumference = 22112/78  m

Circumference = 2πR = Diameter * (22/7)  = 22112/78

=> Diameter = 90.2 m

3.  Area of Path = ( 120 + 2 + 2)(90 + 2 + 2) - 120 * 90  = 856 m²

4. Cost of Fencing  = 216940

  Rate of Fencing = 255 per m

 Length of Fencing = Circumference = 216940/ 255  m

Circumference = 2πR = 2 * (22/7) * Radius = 216940/ 255

=> Radius =  135.3 m

5. Area of Rectangle = 24 * 6 = 144 cm²

  Area of Each circle = πR² = 28.26 cm²

area of 4 circle = 113.04‬ cm²

 Shaded area =144  -113.04=   30.96 cm²

Learn More :

A Path

https://brainly.in/question/9435948

Cost of construction

https://brainly.in/question/8975777

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