AC Lim's answer to Lau's Primary 6 Maths Measurement Singapore question.

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AC Lim
Ac Lim's answer
12482 answers (A Helpful Person)
1st
Perimeter= ½×πd + (3×4)
= ½×3.14×6 + 12
= 9.42 + 12
= 21.42 cm