Question

write the equations of these circles
please help me

Answer 1

Answer:

equation of circle =(x-a)^2+(y-b)^2=c^2

where (a,b) are the coordinates of centre of circle and c is the length of radius

here all the centres are origin so a,b are zeroes

so 1st equation=(x-0)^2+(y-0)^2=(3/2)^2

or 4x^2+4y^2=9

2nd equation =(x-0)^2+(y-0)^2=(.25)^2

or 4x^2+4y^2=1

3rd equation=(x-0)^2+(y-0)^2=(√3)^2

or x^2+y^2=3