If AB is 12, what is the length of A' B'?

8 units

Step-by-step explanation:

As we can see, the two triangles are similar

If two triangles are similar, then the ratio of their sides are equal

thus, mathematically;

12/6 = x/4

2 = x/4

x = 2 * 4

x = 8

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.