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sudut BOC = 80 derajat dan sudut DOC = 70 derajat serta sudut AOB = 90 derajat
phi = 22/7
sudut AOD = (360-80-70-90) = 120
luas jur. AOD = α/360 x phi.r²
120/360 x 22/7 x 14² = 205,3
26. luas juring AOB = 32 cm² dan sudut AOB = 60
sudut AOC = (360-60-150) = 150
misalkan luas juring AOC = X
pakek perbandingan
sudut AOB / sudut AOC = luas juring AOB/luas juring AOC
60/150 = 32/X
2/5 = 32/X > dikalikan silang
2X = 160
X = 80 cm²