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Solutions ⇒ Class 10th ⇒ Mathematics ⇒ 12. Areas Related to Circles

Exercise 12.1 Class 10 maths 12. Areas Related to Circles - ncert solutions - Toppers Study

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Exercise 12.1 Class 10 maths 12. Areas Related to Circles - ncert solutions - Toppers Study

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Exercise 12.1 class 10 Mathematics Chapter 12. Areas Related to Circles

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12. Areas Related to Circles

| Exercise 12.1 |

Exercise 12.1 Class 10 maths 12. Areas Related to Circles - ncert solutions - Toppers Study


Exercise: 12.1


Q.1   The radii of two circles are 19 cm and 9 cm respectively. Find the radius of the circle which has circumference equal to the sum of the circumferences of the two circles.

Solution:

                Let the radius of acquired circle = R

                And radius of Large circle r1 = 19 cm

                        Radius of small circle r2 = 9 cm

              Then,

              2πR = 2πr1 + 2πr2

              2πR = 2π (r1 + r2)

                   R = (r1 + r2)

                       = 19 + 9

                       = 28 cm

             

Q2.   The radii of two circles are 8 cm and 6 cm respectively. Find the radius of the circle having area equal to the sum of the areas of the two circles.

Solution:

                Let the radius of acquired circle = R

                And radius of Large circle r1 = 8 cm

                        Radius of small circle r2 = 6 cm

Then,

              πR2 = πr12 + πr22

              πR2 = π (r12 + r22)

                   R2 = (r12 + r22)

                       = 82 + 62

                       = 64 + 36 cm

                       = 100 cm           

                  R = √100 = 10 cm 

Q3.   Depicts an archery target marked with its five scoring areas from the centre outwards as Gold, Red, Blue, Black and White. The diameter of the region representing Gold score is 21 cm and each of the other bands is 10.5 cm wide. Find the area of each of the five scoring regions.

Q4.  The wheels of a car are of diameter 80 cm each. How many complete revolutions does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour?

Solution: 

Q5.   If the perimeter and the area of a circle are numerically equal, then find the radius of the circle.

Solution:

2πr = πr2

2r  = r2

2r  = r × r

r = 2 unit

 

 

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Mathematics Class - 11th

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Study Materials List:

Solutions ⇒ Class 10th ⇒ Mathematics
1. Real Numbers
2. Polynomials
3. Pair of Linear Equations in Two Variables
4. Quadratic Equations
5. Arithmetic Progressions
6. Triangles
7. Coordinate Geometry
8. Introduction to Trigonometry
9. Some Applications of Trigonometry
10. Circles
11. Constructions
12. Areas Related to Circles
13. Surface Areas and Volumes
14. Statistics
15. Probability

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