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primary 5 | Maths
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Jerline
Jerline

primary 5 chevron_right Maths

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Date Posted: 7 years ago
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A3ium
A3ium's answer
9 answers (A Helpful Person)
1st
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