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Jawaban:
180-108 = 12 x
x = (180-108)/2 = 6
5x + 2y = 180 - 56
5(6) + 2y = 124
y = (124-30)/2 = 47
4z + 12x + 56 = 180
4z + 12(6) = 180 - 56
4z = 124 -72
z = 52/4 = 13
maka x+y+z = 6° + 47° + 13° = 66°
180 - 108 = 12x
x = ( 180 - 108 ) /2 = 6
5x + 2y = 180 - 56
5 ( 6 ) + 2y = 124
y = ( 124 - 30 ) /2 = 47
4z + 12x + 56 = 180
4z + 12 ( 6 ) = 180 - 56
4z = 124 - 72
z = 52/4 = 13
Maka, x + y + z = 66°
