In the figure below, ∠mROP = 125°. Find the measure of each arc. For each arc, write two or more complete sentences explaining which theorem or postulate you used to find your answer. Include your equations and calculations in your final answer. mQS

What is angle equivalent of arc QS?

the angle equivalent?

Which angle is same as arc QS?

Which central angle intercepts the arc QS?

RP is the same

QOS is same angle

Can you see any relationship between angles QOS and ROP?

Arent they just opposites?

Do you know how is it called? They are vertically opposite angles. Do you know their relationship, like which one is greater or not?

I don't think i do know. I thought they were equal

That's the answer, they are equal

Now can you see what the answer is?

Awesome! But not really

@mhanifa

You have: ∠mROP = ∠mQOS as vertical angles Also you have: ∠mQOS = mQS as central angle is equal to intercepted arc measure: Also you have: ∠mROP = 125° No can you find the measure of mQS?

I'm not sure

Ok, use this tip: If a = b and b = c you can say that a = c

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