SOLUTION: so i am taking a test and my teacher said to find the answer but i dont understand how to get the answer so the question is what is the measure of arc XY and it gives you to angle

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Question 754482: so i am taking a test and my teacher said to find the answer but i dont understand how to get the answer so the question is what is the measure of arc XY and it gives you to angle that equal 90 degrees how would you go about finding out that answer?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

An arc is a part of the circumference between two points or a continuous piece of a circle.
if arc XY gives you to angle that equal 90 degrees which is 1%2F4 of 360 degrees that a full circle has, then the measure of arc XY will be XY=2r%2Api%2F4 => XY=cross%282%29r%2Api%2Fcross%284%292 => XY=r%2Api%2F2