NCERT Class 10 Maths Solutions Chapter - 12 Areas Related to Circles, Ex -12.1

Ex - 12.1

Question 1.  

Solution



Question 2.  Unless stated otherwise, use . 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.


Solution




Question 4.


Solution



Question 5.


Solution

Let radius of circle be r

          Circumference of circle = 2pr

          Area of circle = pr²

Given that circumference of circle and area of circle is equal.

So, 2pr = pr²

2 = r

So radius of circle will be 2 units

Ex-12.2