Tentukan penyiku AOC!

< AOB = (6x +4)° + (5x +9)° = 90°
= 6x +5x = 90° - 4 - 9
= 11 x = 87 °
= x = 77 ° / 11
= x = 7 °

< AOC = (6x +4)°
= 6 .7 +4
= 42 +4 = 46 °

penyiku < AOC = 90 ° - 46 °
= 44 °