J's answer to Lee's Primary 6 Maths Geometry Singapore question.
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Perimeter = 3 semicircles' circumference + 2 radii of semicircle
= 3 x ½ x 2πr + 2r
= 3 x ½ x 2 x 22/7 x 21cm + 2 x 21cm
= 99cm + 42cm
= 141cm
= 3 x ½ x 2πr + 2r
= 3 x ½ x 2 x 22/7 x 21cm + 2 x 21cm
= 99cm + 42cm
= 141cm
Date Posted:
4 years ago
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