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12. Areas Related to Circles Class 10 MATHEMATICS Solutions English Medium-Exercise 12.1
12. Areas Related to Circles Class 10 MATHEMATICS Solutions English Medium-Exercise 12.1 Get chapter-wise detailed explanations, step-by-step answers, important questions and exam-ready study material in Hindi and English medium.
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12. Areas Related to Circles Class 10 MATHEMATICS Solutions English Medium-Exercise 12.1
NCERT Solutions for Class 10 are specially prepared according to the latest CBSE syllabus (2026-27) to help students understand every concept clearly. These solutions provide step-by-step explanations, accurate answers, and exam-oriented guidance for all chapters. Class 10 students can improve their problem-solving skills, strengthen conceptual understanding, and prepare confidently for school as well as board examinations. All questions are solved in a simple and easy-to-understand language for both Hindi and English medium learners.
12. Areas Related to Circles Class 10 MATHEMATICS Solutions English Medium-Exercise 12.1
NCERT Solutions Class 10 MATHEMATICS English Medium
12. Areas Related to Circles
Topic: Exercise 12.1
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
All Topics From 12. Areas Related to Circles
See other sub-topics of this chapter:
1. Exercise 12.1 2. Exercise 12.2 3. Exercise 12.3 4. Exercise 12.4NCERT Solutions Class 10 Hindi and English Medium – Complete Study Material
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