Jawabanmu

2014-05-09T16:20:02+07:00
Ljuring = L x sudut/360
Ljuring = 22/7 x 21 x 21 x 72/360
Ljuring = 1386 x 1/5
Luring = 277,2 cm²
1 5 1
2014-05-09T16:20:42+07:00
Luas juring OPQ = 72/360 x 22/7 x 21 x 21 <=> luas juring = 1/5 x22x3x21 = 1386/5 = 277,2cm²   {semoga membantu} :D jadikan yang terbaik ya!