Posted 25 May 2013 If three circles are mutually tangent where one has a radius of 3cm, another has a radius of 4cm, and the last has a radius of 5cm. What is the area of the region bounded between the three circles? 0 Share this post Link to post Share on other sites

0 Posted 26 May 2013 Triangle formed by centers: sides: 7 , 8, 9 angles:73,58,48 (using laws) Area: 26.8328 (Heron's) Sector areas of circles: 3cm: pi3x3x73/360=5.7334 4cm:pi4x4x58/360=8.0983 5cm:pi5x5x48/360=10.4720 Area of sectors=24.30371 Area between circles is 2.52909 area ( triangle -sectors) formed 0 Share this post Link to post Share on other sites

0 Posted 26 May 2013 Triangle formed by centers: sides: 7 , 8, 9 angles:73,58,48 (using laws) Area: 26.8328 (Heron's) Sector areas of circles: 3cm: pi3x3x73/360=5.7334 4cm:pi4x4x58/360=8.0983 5cm:pi5x5x48/360=10.4720 Area of sectors=24.30371 Area between circles is 2.52909 area ( triangle -sectors) formed My answer is most like yours but my sector areas were different (for the 4cm and 5cm circles). 0 Share this post Link to post Share on other sites

0 Posted 27 May 2013 (edited) triangle 7,8,9 w/ height: 7.6665 angles: 73.39798, 58.41164, 48.19038 deg sectors areas:5.7647, 8.1535, 10.5135 Edited 27 May 2013 by TimeSpaceLightForce 0 Share this post Link to post Share on other sites

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If three circles are mutually tangent where one has a radius of 3cm, another has a radius of 4cm, and the last has a radius of 5cm. What is the area of the region bounded between the three circles?

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