Question

Bill designs a table with a glass top.


What is the length of the side AB of the glass top?

30 inches
45 inches
40 inches
15 inches

Answer 1

3/15 = 6/x

Answer 2

x = 30

Answer 3

Thank you

Answer 4

Triangles with the same angles are similar triangles. We can see in the figure that there are two similar triangles.
Now, given two similar triangles, if A and B are corresponding sides and C and D are corresponding sides, like this:

Then, I can set up a ratio like this:
A/B = C/D