Let E (on [DC]) be the point such as ABCE is a rectangle.
Its dimensions are 8x20
So you have DE=DC-EC=20-5=15
ADE is a rectangle triangle in E, so you can use the Pythagorean theorem and have AD
What is length of segment ?
Answer was 17 units.
My answer was different . . . how ?
It's hard to see your work from here . . .
. . But it looks like you played the instead of theCode:A 5 B * - - - * * : | * : | * :8 |8 * : | * : | D * - - - - - + - - - * C : 15 E 5 : : - - - - 20 - - - :
In right triangle , use Pythagorus:
. . .