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sudut = 5 x 30^ = 150^
no.2
penyiku
= 90^ - 56^18'
= 89^60' - 56^18'
= (89-56)^ + (60-18)'
= 33^42'
no.3
jumlah 2 sudut dlm sepihak =180^
tnda ^ sm dg derajat