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P6 Math Circles - Quick Recap

P6 Math Circles - Quick Recap

Teacher16
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P6 Math Circles - Quick Recap

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  1. The distance around a rectangular object is called aperimeter. What do we call the distance around a circular object? The distance around a circular object is called acircumference. Thecircumferenceof a circle is calledperimeter.

  2. What have you learnt? Properties of Circles • Discovery of Pi, π => π = 3.14 (approximate) or centre radius

  3. Question for thought?? How do you find circumference? => π Circumference = π x Diameter Circumference = πD

  4. Circumference and Diameter Circumference = πD • 1 Diameter = 2 Radius • 1 x D = 2 x R Circumference = π x D Circumference = π x 2 x R Circumference = 2 x π x R Circumference = 2πR

  5. Semicircle and Quadrant Length of = x π x D semicircle Length of = x π x D quadrant

  6. Area of a Circle πR2 How does this formula derived?

  7. Look at the shape Rectangle Deduction Area of rectangle = area of a circle

  8. Semicircle Semicircle R πR

  9. Semicircle and Quadrant Area of = πr2 semicircle Area of = πr2 quadrant

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