First we find the measurement of dark dot .
ANd for that we have to use the formula of the angle formed by the intersection of chord .
Let the dark dot be t.
So we have

t and z are linear pair and sum of angles of linear pair =180 degree.
So we get

Answer:
C. 666
Step-by-step explanation:
USING PEMDAS we can solve this problem.

Answer:
x=8
Step-by-step explanation:
Answer:
right triangel
Step-by-step explanation:
the sides just add up to that i thinl