[b]PENGERTIAN[br][/b][justify]Balok merupakan suatu bangun ruang dimensi yang terbentuk oleh tiga pasang persegi atau persegi panjang, dengan satu pasang diantaranya berukuran berbeda.[/justify]

[b]RUMUS-RUMUS :[br][/b][b]1. Keliling[/b]    [i]= 4[/i] x [i](panjang[/i] + [i]lebar[/i] + [i]tinggi) = 4[/i] x [i](p[/i] +[i] l[/i] + [i]t)[br][/i][b][br]2. Luas Permukaan[/b] [i]= 2 [/i]x [i]{(p[/i] x [i]l)[/i] + [i](p[/i] x [i]t)[/i] + [i](l[/i] x [i]t)}[br][/i][b][br]3. Volume[/b]    [i]= p[/i] x [i]l [/i]x [i]t[br][br][/i][b]4. Diagonal Ruang [/b] = [math]\sqrt{p^2+l^2+t^2}[/math]

Hasanah akan membuat 3 buah kerangka balok berukuran 6 [math]cm[/math] x 7 [img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAALCAYAAACUPhZAAAAAAXNSR0IArs4c6QAAASBJREFUOE+1078rBlAUxvHPu5FBRClZbCaDKBsDiZjIrwwoySR2GVksVoMiFJNFKeEPkMHKgsVgEitdnbdub+9ret3tnHPv9zznufcW/OMqVGC3ogZPUR/GDb4i7sd1dnYcZ6WscvBv7AR4Ay1IuXusoRsPWEAvtlCLLkznDUrhaeMdTtEX6tKeTSxjFScBSA0nQnEzHlFfCT6Ay1D6VjJiG55RFNMYkzXEvhWMYagSPKmaR2cJOMUdmMNI1GYxiqmIk//H0fCqeD63pQeTWM/gaexk0W7YtR+1PdziILMoWbONxXLwlLvAB9rjglIuCUjKkvLXDNaE9yw+x2GI+U2Xey1LeIlGRREzOMomGoz7yR2sw+dfr6WqX6rSJ6pKkx8l1TYM6PVtOgAAAABJRU5ErkJggg==[/img] x 3 [img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAALCAYAAACUPhZAAAAAAXNSR0IArs4c6QAAASBJREFUOE+1078rBlAUxvHPu5FBRClZbCaDKBsDiZjIrwwoySR2GVksVoMiFJNFKeEPkMHKgsVgEitdnbdub+9ret3tnHPv9zznufcW/OMqVGC3ogZPUR/GDb4i7sd1dnYcZ6WscvBv7AR4Ay1IuXusoRsPWEAvtlCLLkznDUrhaeMdTtEX6tKeTSxjFScBSA0nQnEzHlFfCT6Ay1D6VjJiG55RFNMYkzXEvhWMYagSPKmaR2cJOMUdmMNI1GYxiqmIk//H0fCqeD63pQeTWM/gaexk0W7YtR+1PdziILMoWbONxXLwlLvAB9rjglIuCUjKkvLXDNaE9yw+x2GI+U2Xey1LeIlGRREzOMomGoz7yR2sw+dfr6WqX6rSJ6pKkx8l1TYM6PVtOgAAAABJRU5ErkJggg==[/img] terbuat dari kawat. Jika kawat yang tersedia 2 [math]m[/math], panjang sisa kawat adalah...[justify][b]JAWABAN[br][/b]Diketahui : Balok ukuran = 6 [img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAALCAYAAACUPhZAAAAAAXNSR0IArs4c6QAAASBJREFUOE+1078rBlAUxvHPu5FBRClZbCaDKBsDiZjIrwwoySR2GVksVoMiFJNFKeEPkMHKgsVgEitdnbdub+9ret3tnHPv9zznufcW/OMqVGC3ogZPUR/GDb4i7sd1dnYcZ6WscvBv7AR4Ay1IuXusoRsPWEAvtlCLLkznDUrhaeMdTtEX6tKeTSxjFScBSA0nQnEzHlFfCT6Ay1D6VjJiG55RFNMYkzXEvhWMYagSPKmaR2cJOMUdmMNI1GYxiqmIk//H0fCqeD63pQeTWM/gaexk0W7YtR+1PdziILMoWbONxXLwlLvAB9rjglIuCUjKkvLXDNaE9yw+x2GI+U2Xey1LeIlGRREzOMomGoz7yR2sw+dfr6WqX6rSJ6pKkx8l1TYM6PVtOgAAAABJRU5ErkJggg==[/img] x 7 [img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAALCAYAAACUPhZAAAAAAXNSR0IArs4c6QAAASBJREFUOE+1078rBlAUxvHPu5FBRClZbCaDKBsDiZjIrwwoySR2GVksVoMiFJNFKeEPkMHKgsVgEitdnbdub+9ret3tnHPv9zznufcW/OMqVGC3ogZPUR/GDb4i7sd1dnYcZ6WscvBv7AR4Ay1IuXusoRsPWEAvtlCLLkznDUrhaeMdTtEX6tKeTSxjFScBSA0nQnEzHlFfCT6Ay1D6VjJiG55RFNMYkzXEvhWMYagSPKmaR2cJOMUdmMNI1GYxiqmIk//H0fCqeD63pQeTWM/gaexk0W7YtR+1PdziILMoWbONxXLwlLvAB9rjglIuCUjKkvLXDNaE9yw+x2GI+U2Xey1LeIlGRREzOMomGoz7yR2sw+dfr6WqX6rSJ6pKkx8l1TYM6PVtOgAAAABJRU5ErkJggg==[/img] x 3 [img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAALCAYAAACUPhZAAAAAAXNSR0IArs4c6QAAASBJREFUOE+1078rBlAUxvHPu5FBRClZbCaDKBsDiZjIrwwoySR2GVksVoMiFJNFKeEPkMHKgsVgEitdnbdub+9ret3tnHPv9zznufcW/OMqVGC3ogZPUR/GDb4i7sd1dnYcZ6WscvBv7AR4Ay1IuXusoRsPWEAvtlCLLkznDUrhaeMdTtEX6tKeTSxjFScBSA0nQnEzHlFfCT6Ay1D6VjJiG55RFNMYkzXEvhWMYagSPKmaR2cJOMUdmMNI1GYxiqmIk//H0fCqeD63pQeTWM/gaexk0W7YtR+1PdziILMoWbONxXLwlLvAB9rjglIuCUjKkvLXDNaE9yw+x2GI+U2Xey1LeIlGRREzOMomGoz7yR2sw+dfr6WqX6rSJ6pKkx8l1TYM6PVtOgAAAABJRU5ErkJggg==[/img][br]    Banyak balok yang dibuat = 3 buah[br]    Persediaan kawat = 2 [img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABEAAAALCAYAAACZIGYHAAAAAXNSR0IArs4c6QAAAN9JREFUKFOt0rErxVEYxvHPHd0MmDBJBmUwWKxSUlaKVVKKwSDd5d6s7Iq/gDKaKIPBYGClTP4Bm5XeetXp1P0NN2d7T8/7Pc/7vKflH06rYsziE995H/VboVnHTf1uCdnGKDZxhEUMYwLLOMMQFrBVgmon03jGPq4wgi9spINxvGCyCTKDc6ykaBXHWMr6MN12myDhYA57KTrAPHayfkQHbdz/gepxbhHC0xRc4AHXWf8geno46QcJUWzkvWgay1zi6hVTWMNTP8guLot5I5u7aqWR20dTJgN9vTqTgSC/QxwiDFQPbp8AAAAASUVORK5CYII=[/img]= 2000 [img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAALCAYAAACUPhZAAAAAAXNSR0IArs4c6QAAASBJREFUOE+1078rBlAUxvHPu5FBRClZbCaDKBsDiZjIrwwoySR2GVksVoMiFJNFKeEPkMHKgsVgEitdnbdub+9ret3tnHPv9zznufcW/OMqVGC3ogZPUR/GDb4i7sd1dnYcZ6WscvBv7AR4Ay1IuXusoRsPWEAvtlCLLkznDUrhaeMdTtEX6tKeTSxjFScBSA0nQnEzHlFfCT6Ay1D6VjJiG55RFNMYkzXEvhWMYagSPKmaR2cJOMUdmMNI1GYxiqmIk//H0fCqeD63pQeTWM/gaexk0W7YtR+1PdziILMoWbONxXLwlLvAB9rjglIuCUjKkvLXDNaE9yw+x2GI+U2Xey1LeIlGRREzOMomGoz7yR2sw+dfr6WqX6rSJ6pKkx8l1TYM6PVtOgAAAABJRU5ErkJggg==[/img][br]Ditanya  : Panjang sisa kawat?[br]Penyelesaian :[br][br][i][b][u]Langkah 1 : Mencari kerangka satu balok (keliling)[/u][/b][br][/i]Keliling 1 balok = [i]4[/i] x [i](p[/i] +[i] l[/i] + [i]t) [/i]= [i]4[/i] x [i](6[/i] +[i] 7[/i] + 3[i]) [/i]= [i]4[/i] x 16 = 64 [img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAALCAYAAACUPhZAAAAAAXNSR0IArs4c6QAAASBJREFUOE+1078rBlAUxvHPu5FBRClZbCaDKBsDiZjIrwwoySR2GVksVoMiFJNFKeEPkMHKgsVgEitdnbdub+9ret3tnHPv9zznufcW/OMqVGC3ogZPUR/GDb4i7sd1dnYcZ6WscvBv7AR4Ay1IuXusoRsPWEAvtlCLLkznDUrhaeMdTtEX6tKeTSxjFScBSA0nQnEzHlFfCT6Ay1D6VjJiG55RFNMYkzXEvhWMYagSPKmaR2cJOMUdmMNI1GYxiqmIk//H0fCqeD63pQeTWM/gaexk0W7YtR+1PdziILMoWbONxXLwlLvAB9rjglIuCUjKkvLXDNaE9yw+x2GI+U2Xey1LeIlGRREzOMomGoz7yR2sw+dfr6WqX6rSJ6pKkx8l1TYM6PVtOgAAAABJRU5ErkJggg==[/img][br][i][b][br][u]Langkah 2 : Mencari panjang kawat untuk 3 buah balok[/u][/b][br][/i]Panjang Kawat 3 buah = [i]3 x keliling 1 balok = 3 x 64 = 192 [/i][img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAALCAYAAACUPhZAAAAAAXNSR0IArs4c6QAAASBJREFUOE+1078rBlAUxvHPu5FBRClZbCaDKBsDiZjIrwwoySR2GVksVoMiFJNFKeEPkMHKgsVgEitdnbdub+9ret3tnHPv9zznufcW/OMqVGC3ogZPUR/GDb4i7sd1dnYcZ6WscvBv7AR4Ay1IuXusoRsPWEAvtlCLLkznDUrhaeMdTtEX6tKeTSxjFScBSA0nQnEzHlFfCT6Ay1D6VjJiG55RFNMYkzXEvhWMYagSPKmaR2cJOMUdmMNI1GYxiqmIk//H0fCqeD63pQeTWM/gaexk0W7YtR+1PdziILMoWbONxXLwlLvAB9rjglIuCUjKkvLXDNaE9yw+x2GI+U2Xey1LeIlGRREzOMomGoz7yR2sw+dfr6WqX6rSJ6pKkx8l1TYM6PVtOgAAAABJRU5ErkJggg==[/img] [br][i][b][br][u]Langkah 3 : Mencari sisa kawat[/u][/b][br][/i]Sisa Kawat = [i]panjang kawat seluruhnya - kawat yang dibutuhkan untuk 3 buah balok[br] = 200 - 192[br] = 8 [/i][img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAALCAYAAACUPhZAAAAAAXNSR0IArs4c6QAAASBJREFUOE+1078rBlAUxvHPu5FBRClZbCaDKBsDiZjIrwwoySR2GVksVoMiFJNFKeEPkMHKgsVgEitdnbdub+9ret3tnHPv9zznufcW/OMqVGC3ogZPUR/GDb4i7sd1dnYcZ6WscvBv7AR4Ay1IuXusoRsPWEAvtlCLLkznDUrhaeMdTtEX6tKeTSxjFScBSA0nQnEzHlFfCT6Ay1D6VjJiG55RFNMYkzXEvhWMYagSPKmaR2cJOMUdmMNI1GYxiqmIk//H0fCqeD63pQeTWM/gaexk0W7YtR+1PdziILMoWbONxXLwlLvAB9rjglIuCUjKkvLXDNaE9yw+x2GI+U2Xey1LeIlGRREzOMomGoz7yR2sw+dfr6WqX6rSJ6pKkx8l1TYM6PVtOgAAAABJRU5ErkJggg==[/img][i][br][br][/i]Jadi, kawat yang tersisa adalah 8 [img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAALCAYAAACUPhZAAAAAAXNSR0IArs4c6QAAASBJREFUOE+1078rBlAUxvHPu5FBRClZbCaDKBsDiZjIrwwoySR2GVksVoMiFJNFKeEPkMHKgsVgEitdnbdub+9ret3tnHPv9zznufcW/OMqVGC3ogZPUR/GDb4i7sd1dnYcZ6WscvBv7AR4Ay1IuXusoRsPWEAvtlCLLkznDUrhaeMdTtEX6tKeTSxjFScBSA0nQnEzHlFfCT6Ay1D6VjJiG55RFNMYkzXEvhWMYagSPKmaR2cJOMUdmMNI1GYxiqmIk//H0fCqeD63pQeTWM/gaexk0W7YtR+1PdziILMoWbONxXLwlLvAB9rjglIuCUjKkvLXDNaE9yw+x2GI+U2Xey1LeIlGRREzOMomGoz7yR2sw+dfr6WqX6rSJ6pKkx8l1TYM6PVtOgAAAABJRU5ErkJggg==[/img].[/justify]