Question

help?

Answer 1

use equal intercept theorem,
\(\Large \dfrac{AG}{GD}= \dfrac{AF}{FE}\)

then yo'll get GD
AD is just AG+GD

Answer 2

16 / GD = 20 / 5

16 * 5 / 20 = GD

GD = 4

AD = 20

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walkingdead - seems we agree
(except you made a small error when you said:
"that is, GD = 20"

where GD = 4

Answer 3

thank you for the medal katrina