NotesMath · P6Circles
Circles & Composite Figures Notes
Master the four circle formulas, then combine them for composite figures made of quarters, semicircles and rectangles.
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1
Core Formulas
Use π = 22/7 or 3.14 as told.
- ◆Circumference = 2πr = πd
- ◆Area = πr²
- ◆Semicircle area = ½πr²
- ◆Quarter circle area = ¼πr²
2
Composite Figures
Split the figure into simple shapes. Add or subtract areas.
3
Perimeter vs Area
Perimeter uses curved LENGTH (πr or ½πd). Area uses πr².
⚠️ Common Mistakes
Don't fall into these traps
- ✕Using diameter as radius
- ✕Adding straight edges twice when splitting figures
- ✕Mixing π = 22/7 with a decimal answer
Teacher Hidayah's Tip
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Draw the split lines on the composite figure before writing any working.
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Sample Question
Try it, then read the worked solution
Question
A quarter circle of radius 14 cm. Find its area. (Use π = 22/7)
Worked Solution
- 1Area = ¼ × 22/7 × 14 × 14
- 2= ¼ × 22/7 × 196
- 3= 154 cm²
Everything for Circles
Each topic in the library comes with the full 5-piece bundle.
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Before-Class Prep
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After-Class Practice
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Downloadable Notes
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One-Page Mind Map
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Mistake Fix Zone