What is the measure of ebc ?
degrees

The measure of arc EBC is 220°

Step-by-step explanation:

step 1

Find out the measure of angle COB

we know that

m∠COB+m∠DOC=90°  > given problem

we have that

m∠DOC=m arc DC > by central angle

m arc DC=50°

so

m∠DOC=50°

Find m∠COB

m∠COB+50°=90°

m∠COB=40°

step 2

Find out the measure of arc BC

we have that

m arc BC=m∠COB > by central angle

m∠COB=40°

therefore

m arc BC=40°

step 3

Find out the measure of arc EBC

we know that

m arc EBC=m arc EB+m arc BC

m arc EB=180° > because the diameter divide the circle into two equal parts

so

m arc EBC=180°+40°=220°

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step-by-step explanation:

b and c

step-by-step explanation: