Panjang dan lebar persegi panjang 7 : 5. Jika luas persegi panjang tersebut 560cm2, maka keliling persegi panjang tersebut adalah.... a.140 cm b.128 cm c.96 cm d.48 cm Pake cara ya!
Akeloi
Luas = p x l 560 = 7x × 5x 560 = 35 x² x2 = 560/35 x² = 16 x = √16 x = 4
p = 7x p = 7 . 4 p = 28 cm
l = 5x l = 5 . 4 l = 20 cm
kel = 2p + 2l kel = 2 . 28 + 2 . 20 kel = 56 + 40 kel = 96 cm jawabannya yg C
560 = 7x × 5x
560 = 35 x²
x2 = 560/35
x² = 16
x = √16
x = 4
p = 7x
p = 7 . 4
p = 28 cm
l = 5x
l = 5 . 4
l = 20 cm
kel = 2p + 2l
kel = 2 . 28 + 2 . 20
kel = 56 + 40
kel = 96 cm
jawabannya yg C