Tolong banntu darurat

15]
k//l
a : b = 5 : 4
< a + < b = 180° (< lurus)
< a = 5/(5+4) × 180°
< a = 5/9 × 180°
< a = 100°

< b = 4/(5+4) × 180°
< b = 4/9 × 180°
< b = 80°

< f = < b (sehadap)
< f = 80°

< e = < a (sehadap)
< e = 100°

jawabannya : a


16]
< ABC = 50°
< CED = 70°

< ECD = 180° - (< ABC + < CED)
< ECD = 180° - (50° + 70°)
< ECD = 180° - 120°
< ECD = 60° (a)

17]
< STQ = <PRQ
< STQ = 70°
< TSQ = 80°

< SQT = 180° - (< STQ + < TSQ)
< SQT = 180° - (70° + 80°)
< SQT = 180° - 150°
< SQT = 30° (d)

18]
< m = 68° (< luar berseberangan)
jawabannya : (a)

19]
< ABC = < ADC
< ABC = 128°

< CBF = 180° - < ABC
< CBF = 180° - 128°
< CBF = 52° (b)