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Circles, trapezia and missing dimensions
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Circles, trapezia and missing dimensions
Circles, trapezia and missing dimensions
Example 1
A trapezium has parallel sides 4cm and 14cm, and perpendicular height 4cm. Find its area, in cm2.
TrapeziumDiagram not to scaleShow worked answer
Answer: 36
- Area = ½ ×(sum of parallel sides)× height =(4+14)×24=36cm2.
Example 2
A circle has radius 4cm. Find its area, in cm2. Use π=3. Give an exact answer.
CircleDiagram not to scaleShow worked answer
Answer: 48
- Area =πr2.
- Using π=3:3×42=48cm2.
Example 3
A circle has diameter 11cm. Find its circumference, in cm. Use π=3. Give an exact answer.
CircleDiagram not to scaleShow worked answer
Answer: 33
- Circumference =πd.
- Using π=3:3×11=33cm.
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