Q2. Which mistake happens often in composite figures?
✔ Students often confuse radius and diameter or operation signs.
Q3. A square table has side 4m. A circular mat radius 1m is placed. What is remaining area?
✔ Square area is 16, circle is pi, subtract them.
Show transcript
[Slide 1] Seeing Circles in Real Life
Imagine Siti buying food at Tampines Hawker Centre. She sees round plates on square tables. We need to find the area of the empty space.
[Slide 2] Breaking Down Composite Figures
To solve this, we break the figure into parts. We calculate the big square area first. Then we subtract the smaller circle area from it.
[Slide 3] Worked Example at Tampines Park
Wei Ming designs a park plot with side ten metres. A circular pond has radius three metres. We draw bars to show total area minus pond area.
[Slide 4] Avoiding Common Calculation Errors
Many students forget to divide diameter by two for radius. Always check if the number given is radius or diameter. This ensures your calculation is accurate.
[Slide 5] Key Takeaways for PSLE
Remember to split shapes and use the correct formula. Practice these steps for your PSLE exam. You will do well like Mei Ling.