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tan (acb) = 12/16 = 3/4
maka acb = 37 derajat
ab/cb = sin(acb)
sin 37 = 0,6
maka cb = 20 cm
jari-jari = cb/2 = 10 cm
luas arsiran =luas stengah lingkaran - luas sgitiga ABC
luas arsiran = pi*R kuadrat/2 - 1/2*12*16
= 157-96
= 61
*cmiiw