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Circle circumference and area
Circle circumference and area
Example 1
A circle has diameter 5cm. Find its circumference, in cm. Use π=3. Give an exact answer.
CircleDiagram not to scaleShow worked answer
Answer: 15
- Circumference =πd.
- Using π=3:3×5=15cm.
Example 2
A circle has radius 3cm. Find its area, in cm2. Use π=3. Give an exact answer.
CircleDiagram not to scaleShow worked answer
Answer: 27
- Area =πr2.
- Using π=3:3×32=27cm2.
Example 3
A trapezium has parallel sides 5cm and 9cm, and perpendicular height 6cm. Find its area, in cm2.
TrapeziumDiagram not to scaleShow worked answer
Answer: 42
- Area = ½ ×(sum of parallel sides)× height =(5+9)×26=42cm2.
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