Jawabanmu

2014-01-13T18:07:24+07:00
Diket: L=25 phi
ditanya: K...?
jawab:
L= phi r^2
25 phi = phi r^2
25 = r^2
r = V25
 = 5

K= 2 phi r
=2 . 3,14 . 5
=31,4
1 1 1
2014-01-13T19:51:21+07:00
25 π = πr2
r =5


keliling= 2.π.r
2.π.5 = 10π
jadi kelilingnya 10π