If ∠dbc = 40°, then 1. m = 80 2. m = 40 3. m∠ecb = 100 4. m∠dcf = 50

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step-by-step explanation:

“ a line segment that has the endpoints on the circle and passes through the midpoint is called the diameter. the diameter is twice the size of the radius. a line segment that has its endpoints on the circular border but does not pass through the midpoint is called a chord. a circle is the same as 360 small circle up the number 0 . i hope this .