# Sarin learns Perimeter, Area and Volume in school part 53 (Math Question)

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The blog postings are about the Singapore Math. The readers can learn from the postings about Solving Singapore Primary School Mathematics. The blog presenting the Math Concept, Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn deal with Math Modeling, Problem Sum from Lower Primary School to Upper Primary School level. This posting is an upper primary school math question on Perimeter and Shape.

You can read posting Sarin learns Perimeter, Area and Volume in school(Math Concept) to learn the concept of perimeter, area and volume.

Read also the posting on Sarin learns Shapes and Solids in school (Math Concept) to know about shapes.

Upper primary school mathematics question UPQ218

The figure below is formed by 3 identical semi-circles. AB is a straight line of 46cm. Find the perimeter of the figure. Leave your answer in terms of π. Solution:

The length of AB = 46 cm

The sum of the diameters of the 3 identical semi-circles = 46 + 4 + 4 = 54 cm

The total length of the circumference of the three semi-circles = ½ × π × 54 = 27π cm

The perimeter of the figure = 27π + 46 – 4 – 4 = (36π – 38) cm

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