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r2 atau diameter= 20
r= 10
besar sudut POQ kecil =72o
besar sudut POQ besar = 360o – 72o = 288o (o = derajat)
K= 3,14 x 20 = 62,8
L= 3,14 x 10 x 10 = 314
a. panjang busur besa PQ 288:360 x 62.8 = 50,24
b. luas juring besar POQ 288:360 x 314 = 251,2