AC Lim's answer to Sheryl's Primary 6 Maths Percentage Singapore question.

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AC Lim
Ac Lim's answer
12510 answers (A Helpful Person)
Perimeter (arc) of semicircle
= ½×π×28
= 44 cm

Perimeter for shaded parts
= 44 + 19 + 15
= 78 cm