Besar sudut AOC adalah Pake caranya yaa

2x +15 + 6x +5x-30 = 180
13x -15 = 180
13 × = 195
x = 15

aoc = 2x+15+6x =8x+15 =8(15) +15 = 120 +15 = 135 derajat

≡ penyelesaian :

⇒tentukan nilai x :

( 2x + 15 )° + 6x° + ( 5x - 30 )° = 180°
( 2x + 6x + 5x )° + ( 15 - 30 )° = 180°
13x° - 15° = 180°
13x° = 180° + 15°
13x° = 195°
x = 195° / 13°
x = 15

⇒maka, besar ∠AOC :

∠AOC = ( 2x + 15 )° + 6x°
∠AOC = ( 2(15) + 15 )° + 6(15)°
∠AOC = ( 30 + 15 )° + 90°
∠AOC = 45° + 90°
∠AOC = 135° [ opsi. A ]

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