DIK : keliling sebuah persegi panjang adalah 36cm,sedangkan pnjngnya 4cm lebihnya dari lebar. DIT : luas persegi panjang tersebut adlh.......
kpurwaningtyas
Kel = 2 x (p+l) 36 cm= 2x ( [l+4cm] + l) => p = l+4 krn panjang= lebar lebih 4 cm 36 cm = 2 x (2l + 4cm) 36 cm / 2 = 2l+4 cm 18 cm = 2l+4cm 18cm-4cm = 2 x lebar 14 cm = 2 lebar lebar = 14: 2 = 7 cm, panjang = 11 cm Luas = p x l =(11x7) cm = 77 cm
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subkimaru
Diket : p = l + 4 K = 2 (p + l) 36 = 2 ( l + 4 + l) 36 = 4l + 8 4l = 36 - 8 4l = 28 l = 28 / 4 = 7
36 cm= 2x ( [l+4cm] + l) => p = l+4 krn panjang= lebar lebih 4 cm
36 cm = 2 x (2l + 4cm)
36 cm / 2 = 2l+4 cm
18 cm = 2l+4cm
18cm-4cm = 2 x lebar
14 cm = 2 lebar
lebar = 14: 2 = 7 cm, panjang = 11 cm
Luas = p x l
=(11x7) cm
= 77 cm
K = 2 (p + l)
36 = 2 ( l + 4 + l)
36 = 4l + 8
4l = 36 - 8
4l = 28
l = 28 / 4
= 7
p = l + 4
= 7 + 4
= 11
luas = p x l
= 7 x 11
= 77