What is an equivalent formula to b=a+c/d?

Well,

1). A = B - C/D

2). C = D(B - A)

3).  D =

“ a line segment that has the endpoints on the circle and passes through the midpoint is called the diameter. the diameter is twice the size of the radius. a line segment that has its endpoints on the circular border but does not pass through the midpoint is called a chord. a circle is the same as 360 small circle up the number 0 . i hope this .

add a picture or measurements so i cab