jawab pakai cara nyaaaa :)


1. 891=s^2\xd711 | s^2=81 | s=9 | 2. Lalas+tutup=2\xd714\xd714=392 | Lselimut=4\xd714\xd724=1344 | Lp=392+1344=1736 maaf berantakan, semoga membantu^^
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1. V prisma = Lalas.t prisma, 891 = Lalas . 11, Lalas = 891/11, Lalas = 81, luas alas berbentuk persegi, Lpersegi = s\xb2, 81 = s\xb2, s = 221a81, s = 9,