...this with an arc which is the full length of the circle and therefore has a central angle of 360° So, an arc of length 2πr subtends an angle of 360° The...

1 Answers · Science & Mathematics · 13/01/2014

**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

... Angle of a whole circle is 2π radians. The sector is a fraction of a whole circle: 8/(2π) = 4/π Area of sector = 4/π of area of whole circle...

2 Answers · Science & Mathematics · 10/07/2013

...also use the part/whole proportion arc/circum =

**sector**/whole area arc/2pi r = 15.3/pi r^2...arc = 10.2 meters PS none**of**these answers are "larger than**a**full circle", they are however slightly...2 Answers · Science & Mathematics · 11/03/2012

...also use the part/whole proportion arc/circum =

**sector**/whole area arc/2pi r = 15.3/pi r^2...arc = 10.2 meters PS none**of**these answers are "larger than**a**full circle", they are however slightly...1 Answers · Science & Mathematics · 27/02/2017

...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

**A**circle forms 360 degrees at the centre Let the angle be x degrees and arc length be y cm 360 / x X y = 360y / x cm is the circumference Circumference = 2pi r So**radius**r = 360y/ x / 2pi cm ANSWER2 Answers · Science & Mathematics · 19/02/2012

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