You can read the story of Sarin and the siblings making greeting cards for their mother by reading posting on Sarin, Hairu and Fatimah make greeting cards for Mother’s Day in Welcome page.
Read posting Sarin learns Lines and Angles (Math concept) to understand the concept of lines and angles. Read also posting Sarin learns Shapes and Solids in school (Math Concept) to know about shapes.
Upper primary school mathematics question UPQ132
Sarin is using a orange paper to make a greeting card for her mother.
The following figure is not drawn to scale shown the orange paper ABCD. He folds the sheet along CE. Given that ∠ ECF = 28°, find
Sarin folds the paper along CE,
∠ EFC = 900
Also, ∠ FEC = ∠ DEC
∠ DCE = ∠ ECF
∠ FEC = 1800 – 900 – 280 = 620
∠ DEF = 2 × ∠ FEC = 2 × 620 = 1240
∠ BCF = 900 – 2 × 280 = 340