It helps you because it makes it easier to divide you just have to keep using place value to find the quitent
The answer should be
(x-10)²+(y+4)²=16
The equation of any circle is
(x – h)² + (y – k)² = r²
(h,k) is the center point and r is the radius
X = 180 - (y+z)
x = 180 (60+80)
x = 180 -140
x = 40