Question

what is the formula to solve angle DBC? (picture to be included)

Answer 1

were you given any numbers?

Answer 2

C=90
because BAD is 180.

Answer 3

yes. angle BAC = 60 degrees

Answer 4

when angle BAC=60 degree so angle BDC is 60 too.BAD is 90 degree. so DBC is 30 degree.
180-(90+60)=30

Answer 5

thanks for putting an explanation and not just the answer. cuz I wanted to learn how it happens to thank you!!! can you explain something else for me if you have the time? @amirreza1870