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50=1650r^2/2520
126000=1650r^2
76.36=r^2
akar 76.36=r
8.7=r
A. luas juring POQ=60/360x22/7x8.7^2
=1/6x22/7x75.69
=39.64 cm^2
B.r=8,7cm
C.L=22/7x8,7^2
=22/7x75.69
=237.88cm^2