Jawabanmu

2014-06-09T20:16:08+07:00
Keliling = phi .d
9,42 = 3,14 .d
3 = d
1,5 = r

luas = 3,14. 1,5.1,5
= 7,065 cm2
2014-06-09T20:16:16+07:00
K = π × d
9,42 = 3,14 × d
9,42 : 3,14 = d
     3 cm    = d

r = 1/2d
r = 1/2 x 3 = 1,5 cm

L = π × r²
L = 3,14 × 1,5²
L = 3,14 × 2,25
L = 7,056 cm²