Question

Question 6: https://snipboard.io/8fja96.jpg

Answer 1

@snowflake0531 c;

Answer 2

Honestly, with this one, take a guess
it's an acute angle... all the other ones are obtuse-

Answer 3

360-130=230
\[\angle DCE=1/2(major ~arc-minor~arc)\]
\[\angle DCE=1/2(230-130)=1/2 \times 100=?\]