Area of Circles Tiana Coley and Brianna Alexander.

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Presentation transcript:

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

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).

Solving the problem Start by finding the areas of each circle separately. (Pi*r2) Circle with radius 5cm(AB). Pi*5^2= 25pi 10cm 5cm T A B Area of first circle is 25pi Circle with radius 10cm (AT). Pi*10^2=100pi Area of second circle is 100pi. 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.

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) AE S 9cm 6 cm

CIRCLES: TIANA COLEY AND BRIANNA ALEXANDER Answer:45pi.