Question

In triangle DEF, what is sin D, in simplified form?

Answer 1

According to the picture represented above, sin D = is opposite side divide hypothenuse. And that's actually the main point which make everything clear, here :
$sin D = 20/25$
then 
$sin D = 4/5$. And that's all! As you can see, the correct answer is B.

Answer 2

Answer:

sin D = 4/5

Hope this helps :)