S1 is located at (100,200). It's distance to the epicenter is 100 √ 10 miles

S2 is located at (400,500). It's distance to the epicenter is 200 miles

S3 is located at (700,100). It's distance to the epicenter is 100 √ 13 miles

1)What is the radius of S1? S2? S3?

2)State the equations, in standard form, for circles S1, S2, S3.

3)State the distance from the base (0,0) to the epicenter?

Please help me.