Sebuah persegi panjang mempunyai ukuran panjang (x + 3) cm dan lebar (x -2), keliling persegi panjang adalah 22 cm, tentukan luas persegi panjang tersebut!
dewiayu123
2p + 2l = K 2(x + 3) + 2(x -2) = 22 2x +6 +2x -4 = 22 4x = 20 x = 5 maka p = x +3 = 5 + 3 = 8 cm l = x -2 = 5 -2 = 3 cm maka L = p. l = 8. 3 = 24 cm^2
22 = 2 (2x +1 )
22cm = 4x + 2
20cm = 4x
x = 5cm
p= x+3 = 5+3 =8cm
l = x-2 = 5-2 = 3cm
L = pxl
L = 8cm x 3cm
L = 24cm²
Semoga membantu
2(x + 3) + 2(x -2) = 22
2x +6 +2x -4 = 22
4x = 20
x = 5
maka
p = x +3 = 5 + 3 = 8 cm
l = x -2 = 5 -2 = 3 cm
maka
L = p. l = 8. 3 = 24 cm^2