CLASS 10 MATH NCERT SOLUTIONS FOR CHAPTER – 12 Areas Related to Circles Ex – 12.1

Areas Related to Circles

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

Solution:
Ex 12.1 Class 10 Maths NCERT Solutions PDF Q1

Question 2.
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:
Exercise 12.1 Class 10 Maths NCERT Solutions PDF Q2

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Question 3.
The given figure depicts an archery target marked with its five scoring regions from the center outwards as Gold, Red, Blue, Black, and White.
NCERT Solutions for Class 10 Maths Chapter 12 Areas Related to Circles Ex 12.1 Q3
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.

Solution:
Exercise 12.1 Class 10 Maths NCERT Solutions PDF Q3
Exercise 12.1 Class 10 Maths NCERT Solutions PDF Q3.1

Question 4.
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:
Ch 12 Maths Class 10 NCERT Solutions Ex 12.1 PDF Q4

Question 5.
Tick the correct answer in the following and justify your choice: If the perimeter and the area of a circle are numerically equal, then the radius of the circle is

(a) 2 units
(b) n units
(c) 4 units
(d) 7 units

Solution:
Ex 12.1 Class 10 Maths NCERT Solutions PDF Q5