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b. sejajar = AB sejajar dengan KL
c. bersilangan = KL berselangan dengn DC
10. a. sudut lancip = sudut ADC, DAE, DCE
b. sudut tumpul = ABC, BAD, BCD
C. Siku2= AEB, BEC, AED
D. BED, AEC
12. 4x +5x = 180
9x = 180
x= 20
POQ = 4x = 4(20) = 80