Jawabanmu

2014-04-23T20:05:50+07:00
(1/2s)^2=15^2-12^2=225-144=81 | 1/2s=9 | s=18 | Lp=4(L▲)+s^2=4(1/2×18×15)+18^2=540+324=864 semoga membantu, maaf berantakan^^
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