Jawabanmu

2014-03-25T23:17:27+07:00
1. 60+x = 90
x = 90-60
x = 30°

2.
a)3x+4x+5x = 180
12x = 180
x = 15°
b) <abc = 5x = 5(15) = 75°
c) <fac = 180-4x = 180-4(15) = 180-60 = 120°

semoga membantu:)
2014-03-25T23:34:22+07:00
1. x = 90-60 = 30
2. a) 3x + 4x + 5x = 180
                    12 x = 180
                         x = 15
b) <ABC = 5x = 5(15) = 75
c) <FAC = 180-<BAC = 180 - 4x = 180 - 4(15) = 180-60 = 20