" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
∠AOB + ∠BOC = 90°
3a + 5a+18 = 90
8a = 90-18
8a = 72
a = 9
∠BOC = 5a+18
= 5(9) + 18
= 45+18
= 63°