Celeste's answer to Cahaya Natasha Nabella's Secondary 2 Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Celeste
Celeste's answer
2 answers (Tutor Details)
since triangle BAC and DAC are the same, angle BAC and DAC are the same so by isosceles rule, answer is 130 degrees!