# Sarin learns Shapes and Solids in school part 48 (Math Question)

Standard

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 Lines, Angles and Shapes.

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

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

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

Upper primary school mathematics question UPQ403

The figure below is not drawn to scale. Given that AB, CD and EF are straight lines, find ∠x.

Solution:

AB and CD are straight lines and intersect at G

∠ BGD = ∠ ACG = 370

CD and EF are straight lines and intersect at I

∠ CIE = ∠ FID = 730

The three lines intersect each others as shown to form a triangle GIH

∠ x is the external angle of the triangle GIH

∠ x = ∠ BGD + ∠ CIE = 370 + 730 = 1100