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5. 4a + 18 + 2a = 90
6a + 18 = 90
6a = 72
a = 12
COB = 4.12 + 18 = 66
Pelurus COB = 180 - 66 = 114
5. 2a+4a+18=90
6a+18=90
6a=90-18
6a=72
a=72:6=12cm
sudut COB=4a+18
=(4X12)+18
=48+18=66
jadi, pelurus COB = 180 - 66 = itung sendiri ya kak :D
semoga membantu (^^)