Question

Keliling sebuanh persegi panjang 76 cm. Jijka selisih antara panjang dan lebar persegi panjang tersebut 10 cm tentukanlah .. || please tolong d bantu

Answer 1

Diket :
K = 76 cm
p - l = 10
p = 10 + l

Maka,
K = 2(p + l)
76 = 2(p + l)
38 = p + l

Masukkan p,
38 = p + l
38 = (10 + l) + l
38 = 10 + 2l
38 - 10 = 2l
28 = 2l
l = 28/2
l = 14 cm

Masukkan l,
38 = p + l
38 = p + 14
38 - 14 = p
p = 24 cm

Jadi, panjang = 24 cm dan lebar = 14 cm

Answer 2

Kliling = 2 ( P + L)
P - L = 10
P = 10+L
Luas = 2 ( p +L)
76 = 2 ( 10 + L + L)
76/2 = 2L + 10
38 = 2L + 10
2L = 38 - 10
2L = 28
L = 14
P = 14+10=24

Luas= P x L = 14x24 =336cm2