Question

How do I solve for x

Answer 1

when running a line, in a right-triangle, from the 90° angle perpendicular to its opposite side, we will end up with three similar triangles, one Small, one Medium and a containing Large one.

Check the picture below.

Answer 2

Explanation:

Using triangle ratios:

x is to 20 as 21 is to 29

x/20 = 21/29 x = 20 * 21/29 = 14.5 units

OR

x is to 21 as 20 is to 29

x/21 = 20 / 29 x = 21 * 20/29 = 14.5 units