A3ium's answer to Jerline's Primary 5 Maths question.
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Angle FEC=180-117
=63
Angle ECF=180-63-63
=54
Angle ECB=Angle ECF
=54
Angle FCB=54 × 2
=108
Angle ABC=180-108
=72 degrees
=63
Angle ECF=180-63-63
=54
Angle ECB=Angle ECF
=54
Angle FCB=54 × 2
=108
Angle ABC=180-108
=72 degrees
Date Posted:
7 years ago
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