Inside the unit circle `S=x^2+y^2=1, there are three smaller circles of equal radius a, touches to each other and also touches to S. The value of 'a' equals

Inside the unit circle S={(x,y)|x^(2)+y^(2)=1} there are three smaller circles of equal radus a,touches to each other and also touches to S.The value of a equals

inside the circles x^2+y^2=1 there are three circles of equal radius a tangent to each other and to s the value of a equals to

inside the circles x^(2)+y^(2)=1 there are three circles of equal radius a tangent to each other and to s the value of a equals to

inside the circles x^2+y^2=1 there are three circles of equal radius a tangent to each other and to s the value of a equals to

inside the circles x^2+y^2=1 there are three circles of equal radius a tangent to each other and to s the value of a equals to

Three circles of equal radius 'a' cm touch each other. The area of the shaded region is :

Three circles of equal radius 'a' cm touch each other. The area of of the shaded region is :

If two circles S=0 and s'=0 are touch each other externally then