$D$ is on side $\overline {AB}$ of $\triangle ABC.$ We know $\triangle ABC \sim \triangle ACD$ and we know all the marked side lengths. [asy] size(5cm); pair A, B,C, D; A=(0,0); B=(4,0); C=2*dir(48); D=foot(C, A,B) + (-0.3,0); draw(C--A--B--C--D); label("$A$",A, SW); label("$B$",B, SE); label("$C$",C, N); label("$D$",D, S); label("$3$", A--D, S); label("$6$", A--C, W); [/asy] What is the length $AB?$

answer: 25.4 units

step-by-step explanation: radius = 12.7 units

diameter = twice the radius

diameter = 12.7 x 2

= 25.4

jjhjhhjjh

step-by-step explanation:

graph b

step-by-step explanation:

one solution- graph a (clear intercepting point.)

no solution- graph b (they're parallel, there will never be a point of interception.)

infinite solutions- graph c (all points intercept.)

in geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. by extension, a line and a plane, or two planes, in three-dimensional euclidean space that do not share a point are said to be parallel.