38-41.

Mathematics
Tutor: None Selected Time limit: 1 Day

May 20th, 2015

38. r=180l/100pi=16.2/pi

L=2pi*r=2pi*16.2/pi=2*16.2=32.4

39. S=pi*r^2=3.14*25^2=1962.5

40. S=pi*r^2*85/360=74.14

May 21st, 2015

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