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24 votes
This is a practice assessment ( I will send the other half)

This is a practice assessment ( I will send the other half)-example-1
User Allentiology
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1 Answer

29 votes
29 votes

Since R is the center of the circle, then the angle ARD has the same measure than the arc AD, which is 120°.

On the other hand, the measure of the arc ABC will be the same as the measure of the angle ARC, which is 180°.

The measure of the arc ADB is the same as the sum of the measures of the angles ARD, DRC and CRB, which is 120°+60°+40°=220°.

Finally, the measure of arc BD is the same as the sum of the angles BRC and CRD, which is 40°+60°=100°.

User Konrads
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