Find the value of the unknown angle
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value of unknown number is =17
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CEF + DCE = 180 ° [ ANGLE SUM PROPERTY]
CEF + 150° = 180°
a + 150 ° = 180° [ CEF = a ]
a = 180° - 150 °
a = 30°
ABC = BCD [ ALTERNATE ANGLES]
BCD = CEF + BCE
THEREFORE ,
ABC = CEF + BCE
ABC = a + b
70 ° = 30 ° + b
b = 70 - 30
b = 40°
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