Jawabanmu

  • Diwy
  • Gemar Membantu
2014-01-12T22:01:13+07:00
Diket : K = 132 cm
Ditanya : d = ?
              L = ?

Jawab :
K = πd
132 =  \frac{22}{7} x d
 \frac{132x7}{22} = d
d =  \frac{924}{22}
d = 42 ⇒ r =  \frac{1}{2} d = 21 cm

L = π r^{2}
 \frac{22}{7}  21^{2}
= 22/7 x 441 = 22 x 63 = 1386  cm^{2}