The central angle COA = 2 * angle at the circumference
m < COA = 2 * 80 degrees
Answer:
........is your answer
Step-by-step explanation:
Answer:
x = 20
Step-by-step explanation:
Since the triangles are similar then the ratios of corresponding sides are equal, that is
= 
( cross- multiply )
9x = 180 ( divide both sides by 9 )
x = 20
Answer:
radius
Step-by-step explanation:
From the attachment D is a point on the circumference of the circle and B is the center of the circle.
The question demands the name of line segment DB in circle B.
Any line from the center of a circle to the circumference is called a radius.
Therefore line segment DB is a radius.
The second choice is correct.
