# NCERT Solutions for Class 10 Maths Chapter 12 Areas Related to Circles Ex 12.1

NCERT Solutions for Class 10 Maths Chapter 12 Areas Related to Circles Ex 12.1 are part of NCERT Solutions for Class 10 Maths. Here are we have given Chapter 12 Areas Related to Circles Class 10 NCERT Solutions Ex 12.1.

Our free NCERT Textbook Solutions for Chapter 12 Areas Related to Circles will strengthen your fundamentals in this chapter and can help you to score more marks in the examination. Refer to our Textbook Solutions any time, while doing your homework or while preparing for the exam. All questions and answers from the NCERT Book of class 10 Math Chapter 12 are provided here for you for free.

 Board CBSE Textbook NCERT Class Class 10 Subject Maths Chapter Chapter 12 Chapter Name Areas Related to Circles Exercise Ex 12.1 Number of Questions Solved 5 Category NCERT Solutions

## NCERT Solutions for Class 10 Maths Chapter 12 Areas Related to Circles Ex 12.1

Question 1.
The radii of 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:

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:

Question 3.
Fig. 12.3 depicts an archery target marked with its five scoring regions 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.

Solution:

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:

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) π units                  (C) 4 units              (D) 7 units

Solution:

Let radius of circle be r
The circumference of a circle = 2pr
Area of circle = pr2
Given that circumference of circle and area of a circle is equal.
So, 2pr = pr2
2 = r
So radius of circle will be 2 units

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