Jawabanmu

2014-04-18T16:30:25+07:00
2014-04-18T16:33:41+07:00

sudut pusat,

P = P1 + P2

sudut keliling,

K = K1 + K2

K1 + K1 = P1

K2 + K2 = P2
- - - - - - - - - - - (+)

2(K1 + K2) = P1 + P2

2K = P