7.
8.
For 9 and 10, find.
9. ;
10. ;
Circlestangentat are centeredat and. is tangentto both circlesat. Find the radiusof
the smallercircleif.
11. ,
12.
- Fouridenticalcoinsare linedup in a row as shown.The distancebetweenthe centersof the first and
the fourthcoin is inches.Whatis the radiusof one of the coins?