1.

s= arc length = 10

r =15

s= r theta =10 where theta is measured in radian.

15 theta =10

theta =10/15 =2/3 radian

2.

q= 3p/7 ; r =21

s = r theta = 21 * 3pi/7= 9 pi

3.

theta= pi/4 ; s = 3pi

r= s/theta = 3pi/ (pi/4) = 3*4 =12

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