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b. 180 × (4/5) = 144 derajat = sudut tumpul
c. 360 × (5/6) = 300 derajat = sudut refleks
4. (antara 90 derajat sampai 180 derajat) = sudut tumpul
5. (antara 90 derajat sampai 180 derajat) = sudut tumpul