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Area of Circles

Area of Circles. Tiana Coley and Brianna Alexander. Basic Rule. Area of a circle is: pi*r 2 , where ‘r’ is the radius And Pi= 3.14. r. P roblems with area. In circle A, the length of line AT is 10cm, and the length of AB is 5cm. What is the area between the two circles?

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Area of Circles

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  1. Area of Circles Tiana Coley and Brianna Alexander

  2. Basic Rule • Area of a circle is: pi*r2, where ‘r’ is the radius • And Pi= 3.14 r

  3. Problems with area • In circle A, the length of line AT is 10cm, and the length of AB is 5cm. What is the area between the two circles? • The question is asking us to identify the difference between the two circles; therefore, we need to subtract the areas of the smaller circle from the bigger circle(R-r).

  4. Solving the problem • Start by finding the areas of each circle separately. (Pi*r2) • Circle with radius 5cm(AB). • Pi*5^2= 25pi Area of first circle is 25pi T Circle with radius 10cm (AT). Pi*10^2=100pi 10cm Area of second circle is 100pi. 5cm A B Subtract the two areas from each other: (R-r.) 100pi-25pi=75pi Therefore the area between the two circles is 75pi. *Note- side AT and BA are radii.

  5. Try this • In Circle A, SA is 9cm, and EA is 6cm. Find the area between the two circles. (it’s easier to keep the area in terms of pi) S 9cm 6 cm E A

  6. Answer:45pi. Circles:Tiana Coley and Brianna Alexander

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