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60/360 = 18,84/L.lingkaran
1/6 = 18,84/L.lingkaran
L.lingkaran= 18,84 . 6 =113,04
r = √113,04 : 3,14
= √36
= 6(a)
11. L.lingkaran πr² = 22/7 . 21.21 = 1386
α/360 derajat = L Juring/ L Lingkaran
72 derajat/360 derajat = L Juring/1386
1/5 = L juring/1386
L juring = 1386/5 = 277,2 (d)