The blog postings are about the Singapore Math. The readers can learn from the postings on 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 learn the skills to deal 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 Angles and Shapes.

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

Read the posting on __Sarin learns Lines and Angles (Math concept)__ to understand the concept of lines and angles.

*Challenge yourself with the question before look for the given solution‼!*

**Upper primary school mathematics question UPQ549**

The diagram below is made up of a line and 3 identical rectangles.

Solution:

The rectangles are identical,

Each inner angle of the rectangle = 90^{0}

Their breadths are equal in length

The triangle form in the centre of the three rectangles is an equilateral triangle

Each inner angle of the equilateral triangle formed = 60^{0}.

∠ y = 180^{0} – 60^{0} = 120^{0}

The lengths of the rectangles are equal in length

The triangle formed by the line and the rectangle is an isosceles triangle

The sum of the two identical inner angles of an isosceles triangle

= 180^{0 }– 120^{0}

= 60^{0}

∠ x = 60^{0} ÷ 2 = 30^{0}

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