A sector is shaped like a piece of pizza. It has two flat sides at an angle.... The length of each flat side is r, the radius . The length of the arc (the crust, for the pizza) ...
1 Answers · Science & Mathematics · 16/07/2008
...to get the total area of the circle Area of circle equals 12π x 3 = 36π now you know from elementary school that a circle's area is πr^2 so πr^2...36 r=6 --> final answer is that the radius is 6 cm
4 Answers · Science & Mathematics · 15/11/2010
The volume of a cone of radius r and height h is 1/3 pi r^2 h. The surface area of a cone is pi r (sqrt (r^2 + h...interpret the problem is that a sector of a circle (some proportion of a full...
1 Answers · Science & Mathematics · 12/09/2010
1: area of a sector =90/360xπ(r^2) 4π=0.25π(r^2) cut out π 4/0.25=r^2 taking square root on both sides: r=4 so the answer is 4cm. 2: area of a sector =90/360xπ(r^2) 9/8πcm^2=45/360π(r^2) following the same procedure as...
2 Answers · Science & Mathematics · 11/01/2013
A central angle of 40º represents 1/9 of the circle. (1/9) (Area of circle) = 9 π m^2 Area of circle = 81 π π r^2 = 81 π r^2 = 81 r = 9 m QED
2 Answers · Science & Mathematics · 30/05/2009