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:
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Step-by-step explanation:
Answer:
24
Step-by-step explanation:
Answer:
17
Step-by-step explanation:
2x2=4 4-7=3 3x3=21 21-4=17
Answer:no
the answer is c
Step-by-step explanation: