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Solution :

Given, D = `45^(@)` <br> We have, `(D)/(90)=(R)/((pi)/(2))` <br> So, `(45)/(90)=(R)/((pi)/(2))` <br> or, `(1)/(2)xx(pi)/(2) = R` <br> or, `R=(pi)/(4)` <br> Hence, circular measure of `45^(@) "is" (pi^(c))/(4)`.**What is angle; measure of an angle; sense of an angle ; right angle ?**

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