Question 852891
(a)pi/2




Multiply by 180/pi to get



(pi/2)*(180/pi)



(pi*180)/(2*pi)



180/2 ... the 'pi' terms cancel



90



So pi/2 radians = <font size=4 color="red">90 degrees</font>



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(b)-7pi/4 




Multiply by 180/pi to get



(-7pi/4)*(180/pi)



(-7pi*180)/(4*pi)



(-7*180)/4 ... the 'pi' terms cancel



-1260/4



-315



So -7pi/4 radians = <font size=4 color="red">-315 degrees</font>