Jawabanmu

2014-02-27T10:38:08+07:00
Dik Lj KLM=38,5cm2
      r=7 cm
dit <KNM ??
jwb= Lj KLM= <KLM/360 drajat x 22/7 x 7 x7
            38,5  = <KLM/360 drajat x154
            38,5 x 360drajat = 154<KLM
            13860=154<KLM
             <KLM=13860/154=90drajat


<KLM=2 X <KNM
90drajat = 2<KNM
<KNM=90drajat/2=45drajat