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  1. ...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

  2. 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

  3. ... 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

  4. ...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

  5. ...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

  6. ...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

  7. 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 ANSWER

    2 Answers · Science & Mathematics · 19/02/2012

  8. 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

  9. 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

  10. 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

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