CK12 - Geometry

14. Fourcirclesare arrangedinsidean equilateraltriangleas shown.If the trianglehas sidesequalto
    cm, whatis the radiusof the biggercircle?Whatare the radii of the smallercircles?


15. In the followingdrawing,eachsegmentis tangentto eachcircle.The largestcirclehas a radiusof

inches.The mediumcirclehas a radiusof inches.Whatis the radiusof the smallestcircletangentto the
mediumcircle?

16. Circlescenteredat and are tangentat. Showthat , and are collinear.


17. is a commonexternaltangentto the two circles. is tangentto both circles.Provethat


18. A circlewith a -inchradiusis centeredat , and a circlewith a -inchradiusis centeredat ,

where and are inchesapart.The commonexternaltangenttouchesthe smallcircleat and

the largecircleat. Whatkind of quadrilateralis Whatare the lengthsof its sides?

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