# Sarin learns Perimeter, Area and Volume in school part 121 (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 presents the Math Concept, the Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can acquire the skill of dealing with the Math Modeling, the Math Problem Solving and the Problem Sum from Lower Primary School to Upper Primary School level after reading the blog postings. This posting is an upper primary school math question on Shapes, aerimeter and Area.

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

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

Challenge yourself with the question before look out for the given solution!!!

Upper primary school mathematics question UPQ583

The figure is made of 2 identical circles of diameter 14 cm. Find the area of the yellow region. (take π = 3.14)

Solution:

Area of the rectangle = 14 × 28 = 392 cm2

Area of the two circles = 2 × π × 7 × 7 = 307.72 cm2

The differences = 392 – 307.72 = 84.28 cm2

The yellow region is  of the differences

= 84.28 ÷ 4

= 21.07 cm2

Alternative solution:

The area of the blue square = 7 × 7 = 49 cm2

The area of the quadrant =  ×  × 7 × 7 = 38.465 cm2

The difference = 49 – 38.465 = 10.535 cm2

The area of yellow region = 2 × 10.535 = 21.07 cm2