Circle O is shown. 2 secants intersect at a point outside of the circle to form angle 1. The first arc formed is d, and the second arc formed is b. Arcs a and c are the other 2 arcs outside of the secants. Which equation is correct regarding the measure of ∠1? m∠1 = One-half(a – c) m∠1 = One-half(a + c) m∠1 = One-half(b – d) m∠1 = One-half(b + d)

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation:

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

answer: 12,000

step-by-step explanation: first you ar e supposed to add. then multiply then subtract