5,7 and 8 are right angles, and 6 is an acute angle this is because of u look at 9 and 10 you can see a little box looking thing under the h and if u do that to all of them 5, 7 and 8 can fit the little box but 6 you can’t because it is an acute angle. Hope this helped!
Answer:
The length of DE is 5 because they are similar triangle .
I’m sorry I can’t help you, i would need more information
The first digit of the quotient is the first number of the answer of your division problem. the answer is 2
