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20x - 1 + C = 360°
Jika dilihat dari gambar, ada segitiga siku siku AB dan siku di titik tengah
180° = 90° + A + B
90° = 4x - 5 + 9x - 13
90° = 13x - 18
108° = 13x
x = 8.3
Sudut A = 4x -5
= 4(8.3) - 5
= 28,2°
Sudut B = 9x - 13
= 9(8.3) - 13
= 61,7°
Sudut D = 7x + 17
= 7(8.3) + 17
= 75,1°
A + B + C + D = 360°
28,2 + 61,7 + C + 75,1 = 360°
C = 360 - 165
C = 195°
Masukkan Rumus yg tadi
20x - 1 + C = 360°
20(8.3) - 1 + C = 360°
166 - 1 + C = 360°
165 + C = 360°
C = 360 - 165
C = 195°
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